Dell XPS M1530 running Vista SP1. Recent problem. When machine automatically enters standy, it will not resume. even after a hard reset. A brief power light and then nothing but fan noise. Black screen, no power light.
Actually when it goes to auto-standby ,it doesn't go all the way. All leds are off and screen is black but fan is going. I do a hard power down, remove the battery and wait a few hours before replacing. Machine will then reboot.
No problem when I manually sleep the machine. No problem with hibernate. Hybrid sleep turned off.
Problem only on Automatic timed mode sleep (which I have turned off for now).