C1/1D Mobo Error?

[kiddscoop]

So I recently was given a custom built PC, and I'm new to all this computer hardware stuff. So about a week ago I've been having a C1/1D error without POST, and I've otried everything. Reseating RAM, unplugging everything and reconnecting it, removing the CMOS battery and putting it back. When I tried to remove the CMOS battery once I unplugged everything, and after about an hour I reconnected it and it booted up. I saw a 23 error on the motherboard. I turned it off because I thought it wasn't reading my keyboard, and when I turned it on again, back to 1D/C1 error. Could this all be happening because of HDD? Prior to this error everything would play fine up until the day before I got the C1/1D errors. when I played games on my PC it would randomly freeze a few times, and I stopped playing altogether because I thought it annoying. And the next day it wouldn't POST. any suggestions?

My specs from looking at the hardware would be

750W power supply
GeForce GTX 460. GPU
500GB Western HDD
2 2GB corsair Ram sticks DDR2
EVGA nForce 750i SLI mobo
CPU unknown :c

 

[Mike2009]

sounds like a dead bios, or dead motherboard , either one isnt good means motherboard is trash, the DDR2 tells me its intel Core2 quad or duo, BUT i have a thing or two to check first. first pull the graphics card, ram out , then put one ram stick in ,,,, turn the pc on see if it turns on ,, (i assume you have an onboard graphics to check if it posts if not youll have to put the 460 back in) this will tell you that its not one of the ram modules that went bad or not. you did the other stuff i would test.