Question Optiplex 990 powers on for half a second

Mar 24, 2020
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Hello, I worked on my PC today and had to unplug all cables from the PSU, and when I plugged all of them back again, the system powers on for half a second with the orange light and shuts off immediately. Any help?

Video of the PC problem is here:
View: https://youtu.be/nscj_x2WhIo
 
Mar 24, 2020
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try the other white RAM slot

unplug the HDD and the DVD drive SATA data cables

is a monitor and a keyboard connected while you are trying to power it on?
  • I swapped the RAM to the other white slot (no success)
  • Unplugged, problem still there
  • No, only the power cable is connected.
 
Mar 24, 2020
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Try both black RAM slots as well

connect a keyboard and a monitor

Does it beep while powering on?

Disconnect the power cable from the wall and use the clear CMOS jumper to reset the BIOS
https://vjauj58549.i.lithium.com/community/image/serverpage/image-id/4874iDEF3C217C3D419DF/image-size/large?v=1.0&px=999
Sorry for the late response,
  • I have switched the RAM on both black ram slots, no result
  • I did, same thing happend.
  • It does not beep nor turn on as you saw from the video
  • Did that, no result.
 

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