Green light

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I have a old hp computer and when I try to turn it on it works but there is this green like that appears for about 10 seconds maybe on the disk drive. Also there is this yellow light that blinks for about a second then goes away but I get no display. I have tried swapping monitors and switching hdmi cables, please help. Thanks!

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Hello Awesomeoo101,

I think the problem with your computer might be found in the power supply unit onthe motherboard. You see black screen because there's not enough power to spin up the hard drive and to load the system.
You can check on this thread whithin the forum: https://ccm.net/forum/affich-174391-flashing-green-light-on-power-supply

Hope this helps.
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Thanks! I kinda knew it might of been the power supply
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I'll be happy if you've solved this. :)