crwdns2934241:0crwdne2934241:0 Niyongabo Valentin

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Vga no input signal, Dvi no input signal

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After turning on the PC there is a beep sound that is keep sounding and then there is an error showing VGA no input signal and DVI no input signal in rainbow Color and then they're showing me that monitor is going to sleep then the monitor make sleep itself

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HP Z400 Workstation

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open