Mac Technology

MacBook Pro Freeze after RAM upgrade

My MacBook Pro came with 4GB of RAM, and 320GB of disk drive. The ThunderBolt technology is also available on my MacBook Pro. I decided recently to upgrade the RAM so it can run smoother with heavy softwares.

Why upgrade MacBook’s RAM?

The main reason to upgrade is that  4GB RAM is not enough on a MacBook Pro if you run a virtual machine with Windows and want to do an RAM intensive work with your Mac. With a total of 8GB RAM, the MacBook Pro runs very smooth, even when running a virtual machine with 1.5GB RAM allocated to Windows 7.

I upgraded my MacBook Pro (early 2011) RAM from 4GB with 2 new CORSAIR 4GB modules, so a total of 8GB  of RAM. I recommend you upgrade your MacBook to 8GB of RAM to enjoy a lot smoother Mac!

The built-in RAM modules from Apple’s MacBook Pro were 2 HYNIX 2GB modules so a total of 4GB RAM.

WARNING: The tests and procedures in this article are for informative purposes only. and its authors take absolutely no responsibility for the damages, errors and troubles you may cause to your devices. Use at your own risk.

RAM issue or not?

Until now, it happened 3 times:

While using my Mac, the screen froze and horizontal lines appeared on the screen. The only way out is to “hard shutdown” the mac by holding down the power button for 7 seconds. From my IT experience, this relates some times to the Graphical Procession Unit (GPU) and some times to the RAM. So either the Graphics card is buggy or the new CORSAIR RAM modules.

Solving : Mac freeze, horizontal lines…

RAM stress test for Mac:

To test the RAM on the Mac, you should run some stress tests to find if any errors lay in the RAM. Sometimes the RAM behaves good in normal conditions but may throw errors on heavy computation. It is recommended to stress the RAM specially if it is new. One of the best tools is MemTest.

Here’s how to use MemTest on Mac:

( I recommend using MemTest on Single User mode to be able to test more memory as in Single User mode the system occupies very few RAM.)

  1. Restart your Mac and hold “Command + S” to go in Single User mode,
  2. A black screen appears with lots of text and after a few moments you will get a prompt,
  3. Type in : memtest all 4
  4. Wait about 1 hour! Remove the 3 to make it just about 20 minutes, but less reliable…
  5. If everything gets passed, your RAM is probably OK
  6. Else, proceed:
  7. The first thing to do is to put back the own Apple’s RAM and run the stress tests again to see if the issue happens or not.

If the new CORSAIR RAM modules are having errors, I should find out which one is messy. I put only one CORSAIR 4GB RAM on the Mac, leaving the other RAM slot empty. Once I find which one is damaged, I will send it back to where I bought it from (, so they can change it for me.

CPU and GPU stress test for Mac:

If the problem is not with the RAM, it is probably with the GPU, or the way the GPU deals with the RAM (as it shares the system’s RAM)

Start your Mac normally, and use “smallLux GPU” (a tool I used and recommend it) to stress the GPU:

  1. Download SmallLuxGPU
  2. Install and run it
  3. On the top left side, in the interactive modes section, Select “Instances 130Mil Scene”
  4. Set the resolution to the maximum available,
  5. Select GPU + 4 CPU threads
  6. Hit “Run Interactive Mode”
  7. Wait…

Your Mac will run and run and will heat up. If everything goes fine for about 20 minutes, your GPU is OK, else if you get errors, freeze or horizontal/vertical lines on screen, there is an issue either with your GPU or the way it handles its memory.

If your GPU passes the tests above, BUT you still have freeze/horizontal or vertical lines issues, then the problem might be software or something very complicated which is not in the scope of this article. You should call an Apple Authorized Repair expert in your area.

In case you have an issue with the GPU, RAM, CPU or any hardware on your Mac, call an Apple specialist as soon as possible. Don’t try to open up you Mac because there is nothing you can do.

Some tools for your Mac:

Mac RAM Stress test:

Memory Tester from diglloydTools

MemTest for Mac

Mac CPU stress test:

Simple Terminal: open up 8 terminal windws and enter (no quotes) ‘yes > /dev/null’

MySQL stress Test on Mac

Stress CPU from [email protected]

CPU / GPU stress test:


CPU, RAM, Hard drive,… Temperature Monitor for Mac:


Fan speed Control for Mac:



Gericom Overdose 1360

Entretien Ordinateur Portable

Il y a quelque jours, j’ai reçu un ordinateur portable Gericom Overdose 1360e pour maintenance, mis à jour et réparation. Première étape consistait a augmenter la RAM, donc j’ai remplacer la RAM par une barrette de 1Go DDR Sodimm. L’entretien du Windows a été un peu long, car après l’installation de Service Pack 3 sur Windows XP Édition Familiale, il a fallut Défragmenter le disque dure…


Un erreur rencontré, était par rapport a la mémoire virtuelle. L’erreur a apparue sur un écran bleu. La solution est de vérifier l’état du fichier PAGEFILE.SYS . Il faut que la taille du fichier PAGEFILE.SYS , soit au moins 1.5 fois la RAM installée. Ceci est a définir dans:gericom_overdose_1360

Panneau de Configuration > Système > Avancé > Performances > Paramètres > Avancé > Modifier

Une fois dans la fenêtre “Mémoire Virtuelle”, choisissez le disque principale de votre système, et choisissez l’option “Taille gérée par le système”.

Autre manipulation importante a effectuer est d’effacer le fichier PAGEFILE.SYS . Ceci entraîne l’utilisation de l’éditeur de registre. Exécutez la commande “regedit” dans l’outil d’exécuter ou dans l’invite de commande.

Une fois dans l’éditeur de registre, naviguez au clé:

HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management

et changez la valeur de la clé “ClearPageFileAtShutdown” de 0 à 1.

Puis ARRETEZ votre ordinateur. (Boutton Démarrer > Arrêter l’ordinateur > Arrêter )

Maintenant votre PAGEFILE.SYS a été effacé, donc remmettez la valeur de la clé du registre à 0 pour accélérer l’arrêt de votre système.

Si le problème persiste, vérifiez le disque dur, en effectuant une défragmentation avec UltraDefrag, et ensuite vérifiez vos barrettes de RAM, car ceci peut provenir des problème hardware. Pour les anciens, veuillez passer de FAT à NTFS pour le format de votre disque dur. Probablement la réinstallation de Windows pourrait résoudre le problème, si ceci provient des conflits logiciel.

Pilotes Gericom Overdose 1360

D’après beaucoup de recherche, et après avoir contacter le service client de Gericom Allemagne, les pilotes du Gericome Overdose 1360 sont disponible pour téléchargement sur le site de téléchargement de Gericom sous le nom de G557. Voici les liens:

BIOS Gericome Overdose 1360

Mettre à jour un BIOS (surtout sur un ordinateur portable) est très risqué. Donc vous serrez entierement responsable des conséquences.

Vous pouvez utiliser la mise a jour du BIOS pour le G557 (d’après le service client de GERICOM Allmagne) voici le lien de téléchargement:

Lisez le fichier AFUWIN.txt pour plus d’information.

Meilleur conseil que je pourrais vous donner, c’est d’acheter un nouveau ordinateur portable avec les configuration récentes du marché..


Buy a Laptop

You gotta buy one someday… no matter when, you’ll have to know what to buy.

so let me give you some tips and advice,

You got some budget, now you need a reason to buy a laptop,

Suppose you live in a very crowded city and you got a small flat of 90 meters square so you need to use your space as efficient as possible, and you cant waste 5 meter square for a desktop PC,

Or, you are always on the move, and anyway you need to carry a computer with you so better be a laptop instead of a desktop computer!

Another thing is that laptops use batteries, so the power output of the battery is limited and known, but desktop computers are connected to the AC Mains of your house, and therefore there is less risk of burning components in laptops!

Think of your eyes too! in desktops with CRT monitor you may get weak eyes after a while, but in laptops and also LCD/PLASMA monitors there is NO RADIATION and you get safe when it comes to eyes.

Power consumption; it’s considerably low when it’s a laptop, as a desktop will get you higher electricity bills!

With all these reasons or the reason that you want a laptop just for fun or for showing it off to your friends let’s move on and talk about how to choose one…

The Laptop:

First thing is the look you should love. Go in the market and see what you can find,

Then it comes to the manufacturer company, better it be a well known company with good customer care and support in your area or the areas you will travel to.

The technical part, which is the inside of your laptop.

The speed, the memory, the features and so on…

before anything, specify your budget and then buy the best laptop in your budget.

* – Let’s start with the processor;

There are two big manufacturers of processors:  Intel and AMD.

Whoever you choose get the fastest and most recent processor model. you can find these information in their own websites. and is a very useful tool while doing research and taking decisions. By date the fastest CPU with intel is Intel Core Duo Processor with Intel Centrio Mobile Technology.

There are two factors when it comes to processors (CPU), first is the clock speed and second is internal cache (L2), where both are important. Don’t get fooled by the clock speed only, you should pay attention to the L2 cache provided.

for example, a 1.7GHz (clock speed) with 1MB of L2 cache is much slower than the same processor with 2MB of L2 cache!

* – Now it comes to RAM which is a big player for your computer’s speed. the more RAM the faster your applications run. Go for as high capacity as you can on RAM.

SDRAM, DDR, DDR2, where SDRAM is the slowest and DDR2 is the fastest. refer to your budget for choosing.

* – The Hard Drive; where you store your data in,

any capacity more than 60 GB will do.  so just see what you can afford and how much data you will have to store.

* – Media disc reader… better be a DVD Writer with dual layer support or AT LEAST a DVD combo (i.e. CD Writer + DVD Reader) (You can go for a BluRay disc reader/writer, but it’s still too costly)

* – Communication…

Check for broadband and modem connectivity, wireless network cards available, infrared availability, integrated bluetooth, USB ports, IEEE 1394 port, and any other port you may need, be careful that more connectivity options will give you better compatibility in different areas.

* – Display size and graphics card…

The bigger and W I D E R screen, the better view, but you will have to carry more weight… so see what you like about the display size.

on graphics card, normally these days laptops come with 128MB on-board shared memory graphics card, which will do for many recent games. but think again if you are presented with a 64MB graphics.

* – Accessories…

Think about your needs and budget, then choose what you want.

* – Warranty

try to get the best warranty option from the company and check for a GLOBAL WARRANTY option if available.

and now you can go through the market and you’ll know what to look for, and the seller can’t fool you anymore.