Optiplex 390 turn on and off

I brought an Optiplex 390 on eBay a few months ago It has 8gb ram, gtx 1050, and an i5 processor with the stock psu. So today I left the PC on overnight to download a game and when I came home it would turn on and turn off with the led number 3. Also, the motherboard has a solid orange color but that was on since I got the system.


Now it turn on for a few seconds with a orange power button and led 1,3

After some time I was able to press the power button and now it boot up after 1 min it shuts off. Next I replace the cpu and did the same thing I was able to get to my login screen and then it shut off after 3 min
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More about optiplex 390 turn
  1. The online manual will tell you what the #3 LED means. The orange MB LED is just power available.
  2. Now it has orange power button and led 1,3
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