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Hello,

I have a problem with a HP EliteDesk805 g6: after I have added a PCI Express Video card this pc started with 6 long beeps and then 3 short beeps. No post, no video.

Now I know this is due to secure boot (I've read some posts on this community).

I removed that Video Card but this pc continues with 6 long beeps and then 3 shorts beeps (also 6 red light blinks and then 3 white led blinks) when I plug DC cord. I expected it would return to use on board video card but nothing happened.

I tried to remove RAM, clear CMOS with yellow button, to remove HD but all was useless.

What should I do?

Thanks in advance

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