Hello there,
Sorry for the trouble.
Could you please send us a picture of SN on the bottom of the PC and a picture of purchase record ?
Here are some potential solutions:
First,please unplug the power supply and HDMI cable.Please hit the pinhole of “CLR CMOS” with a pin for about 10 seconds.Ten minutes later, plug the power supply and HDMI cable, turn on the PC again.
If the problem persists, please try other solutions:
1.Please take out the RAM ,please clean the contacts of the RAM with a rubber.
Here is the tutorial :https://mega.nz/file/XqZX0TIR#_DtO2oa4aRP4bWtvxgKLj4QGhBpQ959cg5U3Yw4u1Cc
2.Please change another HDMI cable.
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://mega.nz/file/7nwDmCaL#UyzSmVkqJG8HW9dhjHhLkkzdP9gt2Br3xyCG1SCdbrA
If it still doesn’t work, please try to replace SSD and RAM or put the SSD or RAM to other devices to test if they work.
4.And pls try to take out one ram out, and then just leave one in the box to see if that machine could work, and the same way to test the other one , to see if that is ram issue.(if your ram is more than 8gb)
Please let us know what happens after you try these steps.
Have a nice day!