Hi,
those beeps sound like faulty gpu, 1 long 2 short.
Reseat the gpu, also reseat the memory, its worth a shot.
Also when reseating items, blow their slots with some air just incase something is in their and causing that beeps.
If you have another video card, can you test that in the pc ? or do you have another pc that you can test the video card in ?
Thats it from me I am afraid, because usually 1 long 2 short beeps means soemthing to do with the video card and if you have already reseated it and inspected the card for damage and found nothing, then the card could just be dead unless you can find out for sure by testing in another rig.
Reseat the ram just incase and also check for anything else that maybe loose and not plugged in properly,
Other than that a setting in the bios/ video card are not set to wake up,
One of the more techie types maybe can help you,
regards
Ps Have a look here on microsoft support for standby/hibernation errors,
http://support.microsoft.com/kb/907477