Pc turns on and off continously

Question

I have an optiplex model name:dcne serial number: . It was working ok but today when I tried to enter windows from hibernation it started turning on and off endlessly with no signal on the monitor. I unplugged it from the power, plugged it again and the same thing happened. From the moment I put DC power cable on it continuously turns on for 5 seconds and turns off, it stays like that for 3 to 5 seconds and then turns on again, not showing anything on screen.

bradthetechnut · Accepted Answer

Couple of videos that might help. I like the BIST test video because it tests various components of the PC.

https://m.youtube.com/watch?v=udGOe7LQJEI

https://m.youtube.com/watch?v=93z-kV6BXKs

Optiplex on & off problem + YouTube List

bradthetechnut · Answer

Try changing the size 2032 CMOS battery. This has solved boot loop problems before. Duracell or Energizer is suggested as Sony only lasted me 2 years. They should last around 5.

If the problem continues afterwards, please let us know and what model Optiplex you have. I don't have the ability to look up serial numbers from here.

lyckos · Answer

The model is optiplex 740. I just tried a new battery with unfortunately the same result.

lyckos · Answer

I found the problem. I took out all 4 ram sims, kept one of them and tested it successively to all 4 slots. One of them turned out faulty. So I

inserted 3 sims in the remaining 3 slots and it worked! Thank you for your help

bradthetechnut · Answer

You're welcome.  Glad to be of help.

exsaini · Answer

changing the CMOS battery fixed my issue. Thank you.

Optiplex Desktops

Pc turns on and off continously

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