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Hello,
Pls try this:
1.Please change another HDMI cable or power supply.
2.Please unplug the power supply and HDMI cable. Please try to hit the hole of "CLR CMOS" with a needle or a pin for about 5-10 seconds.Ten minutes later, plug the power supply and HDMI cable, turn on the PC again.
3.There might be something wrong with the hard ware components.Please take out the SSD and RAM and then put them back , make sure they are installed properly.
Also please clean the gold finger with a rubber.Here is the tutorial https://www.youtube.com/watch?v=hEd_7nmWVOk
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