Unusual start up delay

[Andrew S]

My main pc normally runs 24/7 however a week ago I happened to turn it off overnight.
On restart the next morning there was no bios screen. All the usual noises but nothing else.
I changed the monitor, the monitor cables, and even the video card. Still nothing. Left it turned on whilst I went out for 20 minutes.
Minutes after I returned it decided to boot into windows and has been fine since.
I have switched it off overnight several times since, and had no further problems.
What would be a likely cause of this event?​

 

[Digerati]

What would be a likely cause of this event?

Too many to tell. Loose connection, worn bearings, moisture, gremlins. If it happens again, turn the PSU's master power switch on the back of the PSU off for about 10 seconds, then back on and hit the front power switch. If your PSU does not have a master switch (and many PSU don't), unplug from the wall for 10 seconds.

 

[Andrew S]

Thanks Digerati I'll remember that. It gives a real sinking feeling when a Black screen appears.
PSU has an on/off and the mainboard even has a switch to clear the CMOS. The system recovered however without the use of either.

 

[Digerati]

Thanks for the update.

 

[Stevy22]

How about the cooler that is inside the CPU abnd see if any wire is hitting the FAN Blades

 

[pparks1]

It's possible that you have a bad connection. If the computer runs 24x7, it heats up and the materials expand a bit and it makes a solid connection. Turn it off for awhile, and things subtly shrink back down a little bit and you might be loosing the contact. Could be a card in a slot, memory module in the slot, etc.

Probably not the issue, but a thought.

 

[Andrew S]

Thats a really good explanation pparks, thanks.
Stevy the cooler is pretty well protected I dont think it was a fan problem.

 

[Frostmourne]

Clean out the dust, especially around the PSU.

 

[Andrew S]

Gave it a really good clean out when I swapped out the Video card. The psu fan was not exactly dust free..