I have this weird issue. When I put the computer to sleep by pressing the power button, or using the sleep option in Charms, I can wake it up normally. However, if I close the lid, and later reopen it, all the fans come on, but nothing appears on the screen.
I didn't have this issue using Windows 7.
Here are my system specs:
HP G60-235DX Notebook PC
Intel Pentium Dual Core T4200 at 2.00Ghz
3 GBS of RAM
Intel Graphics Media Accelerator 4500MHD with 1309MB of video memory
Windows 8 Pro 64 bit