Hi, my z420 will not power up. I have tried everything proposed. unconected everything, cleared bios panic bios update procedure. nothing works. blue light on motherboard, acouple of blink in the cdrom then dead after some sec it tries again and again. when all ram out there is a read light at the mainboard and one beep. Either the PSU or the motherborad is dead. Question. Is there a way to test the PSU decoupled from the mainboard?
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