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Hi @ashrafalma93660

i). Have you proved that the monitor and the monitor video cable connected to the PC are OK?

ii). Have you checked if the PC is passing POST (Power On Self Test) on starting?

If you don't hear a single beep just after the PC has been started then most likely there isn't a system speaker (example only) connected to the speaker header pins on the F_Panel header pins on the motherboard - see #9 p.23 for location and #9 p.27 for connection in the motherboard user manual

When you have a speaker connected try starting the PC and check if any beep codes are heard indicating what the problem is that may be preventing the PC from starting and passing POST

If the PC is passing POST can you try another GPU card?

What is the make and model number of the GPU card installed on the motherboard?