Have you tried DrGlowire’s suggestions?
O.K., now unplug the power cable from the power supply, gently remove the silver “coin” battery (should have at least a 2.6v charge) from the motherboard. and press power button for 30 seconds. That alone should clear the BIOS but you can also do as listed below.
If you know where they are, short-out the two pins with the jumper OTHERWISE just leave the computer unplugged for at least 10 minutes or longer.
This will reset the BIOS setting to the “new” computer defaults.
Put the "coin" battery back in, plug power cable in and switch on.
If this doesn’t work you MAY have a bent pin on the CPU or the like.
crwdns2934105:0crwdne2934105:0
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crwdns2915270:0crwdne2915270:0
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For me a bluetooth pci card was like 1mm Loose. -.-
crwdns2934271:0crwdnd2934271:0 Szymon 0105 crwdne2934271:0
1)Just check Ram (If Fan not spinning)...
2) Replace Motherboard (If Fan spinning but no display
...
Next time use Stabilizer to avoid motherboard fault
crwdns2934271:0crwdnd2934271:0 Bloggerpraveen crwdne2934271:0
In my case, the issue was the front panel IO. Unplugging it from the mobo resolved the problem on Optiplex 9020 MT.
crwdns2934271:0crwdnd2934271:0 Stephen Ondiek crwdne2934271:0