Windows Vista Sleep problem!
 

First my specs:
Asus P5Q Pro
Intel E7200 Stock
4GB DDR2 OCZ 800MHz
7200.11 Seagate 500GB SATA HDD
HD4850 Sapphire Video Card w/ Catalyst 8.8
Logitech MX5000 Bluetooth Keyboard+Mouse
Vista 32-bit Ultimate

Ok so here's my problem:

When browsing the web I accidentally hit the moon button on my Logitech keyboard. I didn't change any options, so according to the manual this means it got put in sleep mode. Trouble is, I couldn't get it started again, so had to hold the power button. Now when I turn it on the Monitor (Acer AL2216W) it simply says No signal, I don't see a bios screen or anything. The computer sounds like its running fine, I reseated the video card and ram, nothing seems to be working. I hooked up the monitor to my laptop, and it works fine. I need this running ASAP, any help you guys can provide would be much appreciated! Thanks in advance.