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Hi, I recently got an used HP EliteDesk 800 G1 SSF. When I turned it on, the first time it just beeped once and then proceeded to boot into windows 7. Then I tried to get into the bios to just check the settings and reinstall windows 10 on it. However, when I tried to go into BIOS by pressing ESC the screen stayed blank, the monitor is receiving a signal but it's blank. It's now blank all of the time, and yes I did try different monitors, cables, power supplys, RAM even a different CPU. I also tried to reset the bios multiple ways - take out the battery, push the button, disconnect the machine and take out the battery...

Caps lock and numlock are responding. And when I turn it on it makes one short beep and then the monitor detects the blank output.

Oh, and by the way I have two of them, I just took out and reinserted the HDD and it started to have the EXACT same issue.

Please help me. Thank you.

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