Why would an SSD make sleep mode useless? I, in fact, need it because I often have unfinished work open, and I need a reliable way to save power and still work on the same things the next day. It had always worked fine before , 100% reliable, even with a Revodrive 3 PCI drive, but i started getting trouble when I bought a Samsung SSD EVO 840. The drive itself though, is NOT the issue here as far as i found out now...
If anyone has this issue with an SSD, the screen not coming back after sleep mode but the computer seems to be working fine in the background, and you have installed Samsung Magician, please get rid of it!
I've received this 'magical' piece of software with my EVO 840 SSD and never suspected it before I actually saw an error on the screen after resuming from sleep mode within a few seconds. It is ridiculous of Samsung to ship this piece of crap software with their drives since it's been known that it can cause this behavior.
Hope this can help people, it has cost me many hours of troubleshooting, I even re-installed windows 7 and thought the problem was gone, but of course it started again after I installed Magician, thats why I got suspicious!