I am trying to figure out why my computer doesn't wake up properly from sleep, which happens
about 3 times out of 5 (see update below). Fans and HDDs spins up and looks to be working (according to LED), but my monitor doesn't get any signal from the GFX-card so I am forced to do the infamous norwegian (hard) reboot.
At first I thought it was a faulty HDD (old 2nd gen WD Raptor) that was causing these issues since I got spammed with warning messages about drive inaccessibility from Intel Rapid Storage Technology evertime this happened.
Since I was getting data corruption as well I decided to superannuate my faithful Raptors and replace them with brand new SSDs. At the same time I reinstalled Windows 7, to no avail. The problem persists!
List of hardware I'm running:
- Old PSU: Zalman ZM600-HP
- New PSU: Corsair AX750
- CPU: Intel i7 920
- MB: Asus P6T WS Professional
- RAM: 3x 2GB Corsair Dominator GT
- GFX: Asus EAH5870
- S/HDD: 2x Corsair Force GT, 2x WD Black, 2x WD Green
I am using the latest BIOS, firmwares and drivers for all the hardware, so I do not believe this to be software-related and since I now can deduct the faulty HDD from the equation I suspect it might be the PSU that has a hard time feeding the current for the GFX-card card when waking up from sleep.
So I'm all out of ideas, which is why I'm asking you SUs for help. Any thoughts?
UPDATE: I've done some extensive testing based on the current answers and it seems that this only happens when the computer has been in sleep for a longer period of time (over an hour). I've made sure there's no hybrid sleep going on (hybernation is toggled off anyways), so that can't be the case. To me everything points to the PSU not being able to provide the necessary currents at a "cold start". Could this be the case?
UPDATE 2: Bought a new PSU which seems to have resolved the problem. See my own answer below for more details.
UPDATE 3: Problem is now resolved. See accepted answer for more details.