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hp compaq dc7900 Not turning on flashing LED on the motherboard

HP Recommended
HP compaq dc7900
Microsoft Windows 7 (64-bit)

Hello good day every one, first a little bit of background about me, I'm Ardie and I'm a computer engineer. I have experience in the field of troubleshooting of computers. I have here a HP compaq DC7900 small form factor.

It's not booting up and there's no led signal on front, only a continuous flashing of led on the motherboard with an unusual beep.

Things that I tried so far.

Cleaning of RAM, Changing with known good RAM, Changing RAM slot.

Removing of BIOS battery.

Hard reset, pressing the power button for 1 min.

 

See below link for the video.

Video 

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