It sure would be helpful if you provided the model number.
Normally, my response to such questions is to say that desktops are not designed for power management, so don't use standby or hibernate. And DO NOT use an external switch. Just use the normal shut down and start up procedures.
1st post here.
I have a Dell Vostro slim case. For quite a spell now if allowed to go to sleep OR just turned off - most of the time it will not start back up. If I turn off the power strip for a period of time, then it will start.
When in the sleep mode the light stays on at the front of the case, blinking to show power is still there.
I have downloaded and installed the latest bios, which did not help. My first thought is the power supply, but I thought it might be wise to check here before I get another.
Thanks for your help.