|"everyone gave up on me :"|
Jeez you're impatient!
All the people who answer here do it when they have spare time. There's no guarantee you'll get an answer right away, but you should get at least several within 24 hours
Not all ram you would think should work will work in your mboard.
The specific Kingston module part numbers must be one of these:
If any of them are not, Kingston has no info about whether they will work - they might - they might not.
In the worst cases of ram incompatibility, the mboard WILL NOT BOOT when the incomptible ram is installed, and the mboard may not even beep.
Sometimes each and every module will work fine in any ram slot, yet they won't work properly when more than one is installed.
You should always look up which specific modules are listed for your mboard model - are compatible with it - BEFORE you buy the ram.
If you have installed ANY ram module backwards in a slot and then tried to boot the computer, the ram module that was installed backwards and the ram slot it was plugged into is instantly fried and that ram slot can never be used again, and the mboard may not work properly after that as well.
"NVIDIA GeForce 7950 GX2"
A search of the web using :
NVIDIA GeForce 7950 GX2 minimum watts
A minimum 450W system power supply (with 12V current rating of 27A or more)
You did not need to replace the 480 watt power supply unless it can't provide a +12V current rating of 27A or more.
ATX mboards are always powered in some places by the ATX PS, including some of the contacts in the ram slots, even when the computer is not running, as long as the PS is receiving live AC power.
Did you unplug the computer/PS or otherwise switch off the AC at all times when you were fiddling with installing the ram or changing any other connections?
If you didn't you may have damaged the mboard circuits or the ram or both.
Having BAD ram is extremely rare, but if you DO have BAD ram, it will show up that it's bad when you first install it.
Try installing one of the new ram modules along with the original two to see if that works. If it's compatible it's almost impossible for more than one module to be BAD at a time.
99% of the time when people think they have BAD ram, the actual problem is either they are trying to use ram that isn't 100% compatible with the memory controller in the main chipset or on more recent mboards not 100% comptible with the memory controller built into the cpu, or the ram has a poor connection in it's slots(s).
A common thing that can happen with ram, even ram that worked fine previously, is the ram has, or has developed, a poor connection in it's slot(s).
This usually happens a long time after the ram was installed, but it can happen with new ram, or after moving the computer case from one place to another, and I've had even new modules that needed to have their contacts cleaned.
See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:
If there is nothing wrong with anything else, removing all the ram will get you this result:
Make sure you have a speaker or speakers or the equivalent connected to the mboard so you can hear mboard beeps (see your mboard manual if you need to).
Remove the AC power to the case/power supply.
Remove all the ram.
Restore AC power.
Try to boot.
If nothing else is wrong, you will get no video but you will hear a pattern of beeps that indicate no ram is installed, or a ram problem.
E.g. for an Award bios or a bios based on one, that's often a beep of about a half second, silence for a half second, a beep of about a half second, silence for a half second, continuously.
"updated the BIOS to the version mentioned in above specs".
The bios version probably has absolutely nothing to do with your problem.
You MUST load BIOS DEFAULTS in the bios Setup settings after flashing the bios to a different version because almost always flashing the bios DOES NOT clear the contents of the cmos and replace it with the contents needed for the changed bios version. Did you do that yet?