[john70t]

My Win7 computer would not wake up from sleep mode either about 70-90% of time.
I tried all different combos to see what "saved it" from the auto-restart sequence mode. Never did find out.

Usually, spending less time in sleep mode equated to less restarts, so I was suspecting the 2032 CMOS battery for some reason.
I replaced that on the MB and on next bootup the whole system crashed.
Then it was time for a complete overhaul thanks to that stack of Windows backup DVDs being completely useless even though I followed the rules.
Kicking myself for not researching first before changing things around.

Besides the battery I suspected a bad video card/MB or driver because there were some funky artifacts happening on screen.
Or it was simple Microsoft sabotage.