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HP Compaq Elite 8300 Base Model Small Form Factor PC

Hi guys. I have a mini case model HP Elite8300.I added an internal hard drive to it, it worked fine for two to three days.Today, when I press the power key of the case, the light of the system turns on, But it does not send the signal to the monitor.And the system does not show any errors and does not beep. After about 30 seconds, the fans run at full speed.

I changed the RAMs. And cleaned the CMOS . And I also changed the CMOS battery, but the problem did not change.I suspect that the problem is with the BIOS . please guide me

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