Help!

I don't know what I changed in my bios but I cannot put the computer into sleep mode anymore.

The computer stops, fans included and it starts again.

My config is: C2D 6300, 2GB DDR2 800, 7300GT, Raptor.

All that runs under Vista Ultimate.

If you need bios settings I will get them but please be specific! I don't want to spend 3 hours copying my bios .

Thanks in advance.