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With the aspire 5100 series there is a known issue with ram that causes all sorts of glitches, freezing and reboot. Upon a ram test, the ram will say errors accross the board and replacing the ram will yield the same result. The fix is to update the bios firmware and it will resolve the ram issue. Go to acer's website and click on support and drivers, type in your model number and get the latest bios update..follow the bios update instructions on the site.
You can only do that with onboard video cards. If you have an onboard you can choose how much ram to assign to it in your bios settings. However it is limited and if you already have 128 assigned to it, that's probably about all it's gonna give ya. But hey it never hurts to check
Assigning your physical memory to your graphics card will result a shortage of your total system memory and your whole system will slow down a bit. Video cards meant for better processing the graphical content of your system and free up your system's physical memory.[via] So, if you buy a new and better video card with more memory you will have a fast system with better performance.
Your not alone in this type of problem. When it comes to computer (laptop especially) they usually have a "Max allowed ram" most times its listed in the back of the manual in small print. Its a way to keep people buying new computers (if your into the conspiracy theories) Chances are even a bios upgrade would not fix your problem. Mostly BIOS upgrades add support for new boot options, plug and play support, and fixes to bugs in older versions.
You can check aspires/acers website for updates www.acer.com If they have an update it will comes with documentation as to what the update does.
It could be that one of the chips are faulty and/or are not exactly the same model because faulty chips and ones that have confliction can cause chips to not load properly. It could be that the socket for the ram is faulty as well. Usually you can install 4GB of RAM without the need of a BIOS update Give this a try for the BIOS http://www.acerpanam.com/synapse/forms/portal20.cfm?recordid=4845&formid=3394&website=AcerPanAm.com/au&siteid=8116&words=all&keywords=&areaid=12
You will need winzip or winrar to open the zip file just google either if you dont have them you can get them for free.
You then need to open the folder you just uncompressed and you will see another zip file, winflash is in there. it will allow you to flash the bios from within windows, just install it and follow the instructions on your screen
This is the Paddy_solver and since you are not able to find the bios upgrade i am giving you a link from where you can download your bios update however before you would do it lemme tell you it can crash your motherboard as well i would say if your computer is working fine you better not do it if your computer administrator has said so please go for it. Link to download :- http://support.acer-euro.com/drivers/utilities.html#BIOS
when the website would open you have to look in the middle of the page where it says "BIOS UPDATE TOOLS" NOW BEFORE YOU WOULD INSTALL OR DOWNLOAD ANYTHING PLEASE MAKE SURE YOU SHOULD KNOW THE BIOS INSTALLED ON YOUR LAPTOP FOR THAT YOU HAVE TO ENTER THE BIOS EITHER BY PRESSING "DELETE KEY" OR "F2 KEY " ONCE YOU RESTART THE LAPTOP TRY IT BOTH THE KEYS ONE BY ONE IF YOU ARE NOT ABLE TO GET TO THE BIOS. AND ONCE YOU WOULD SEE THE BIOS IT WOULD EITHER SAY "AWARD BIOS" OR "PHOENIX BIOS" ONCE YOU KNOW WHICH BIOS YOU HAVE THEN DOWNLOAD THE FILE ACCORDINGLY.
HOPE THIS INFORMATION IS USEFUL FOR YOU IF ANY FURTHER QUREY YOU CAN CONTACT ME AT MY EMAIL IE:- email@example.com