Optiplex Desktops

[Nilesh Bommai]

I have a Dell Optiplex 980 SFF 12 GB RAM, i3 540, PNY GT 730, Samsung 840 EVO SSD. After a force shut down, error code 3,4 or 3 flashes and the PC won't turn back on for an hour or so. I don't know what causes this but I'm sure somebody out here knows. I don't usually do force shut downs unless it freezes which happens sometimes.

[bradthetechnut]

Try replacing size 2032 CMOS battery. 

Remove GPU and use onboard graphics.  How does it behave?

Optiplex 980 Service Manual has diagnostic lights.

Also sounds like a PSU on it's way out.  2 ways to test:  1. Try another PSU.  2. PSU testers on Amazon.  Before going through the PSU possible trouble, go according to diagnostic lights after changing battery.

[bradthetechnut · Accepted solution]

A little caveat if trying a PSU tester.  If I remember right @redxps630 , 980 MB's have mini 24-pin connection instead of standard 24-pin.  For PSU tester, 24-pin to mini 24-pin adapter would be needed.

[redxps630]

agree that replace cmos battery is good idea. also try clear cmos settings by using motherboard RTCRST jumper.  see diagram below. move blue jumper on #15 to #2 pins x5 sec then move back.  do not think it is psu issue.

[bradthetechnut]

Link above has too many pop-over ads.  Service Manual has none.  If diagnostic lights change after replacing the battery, see diagnostic lights in the Service Manual.  Easy search using "diagnostic lights."

[bradthetechnut]

Hi @redxps630,

You deleted your post (no need), but I still saw the email.  Thanks for a suggestion of using Safari.  All I could turn off in Chrome is ad personalization.