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HP Recommended
HP Compaq 4000 Pro Small Form Factor PC
Microsoft Windows 10 (64-bit)

Hello everyone, I am facing serious problems and I hope to find a solution with you. Here I have 4 HP Compaq central unit which have problems I will listed below the problems of each one. Unit 1: It lights up correctly The fans turn normally, the screen also lights up but it does not display any images and there is no weird sound with the computer. I have already tested the screen and the cables they are working properly. Unit 2: it automatically turns on when I plug it in, the fans turn normally then at full speed but the screen remains off Unit 3: once plugged in and lit nothing happens, no fan is running and there is a red light blinking 4 times with beeps each time times (4 beeps) Unit 4: When I turn it on it does the same as unit 3 except that for it the CPU fan turns but not the one of the power box

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