Ever since I did a fresh install of Natty (and subsequently Oneiric) I have not been able to wake my desktop from suspend to RAM. Sleep previously worked on Maverick with no problems.

The computer will go into sleep mode after selecting suspend, but when I try to wake it by pushing the sleep button, the monitor remains shut down (not even a blank screen) and the USB keyboard and mouse are both responsive. The desktop tower itself is powered on though.

My setup is as follows:
i7 950
ASUS P6T Deluxe V2
Gigabyte GTX 460
120GB Intel SSD
2x 1TB Hitachi SATA drive

Does anyone have a similar problem? And even if not, do you know how would I go about fixing it?