Question PC turns on but doesn’t display

sugbukz

Distinguished
Apr 15, 2013
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System:
Ryzen 5 5600x 3m old
Msi 2070 duke. 2.5y old
16gb 2800 rib vengeance ram 2.5y old
Msi mpg x570 carbon pro wifi 3m old
Evo 860 500gb ssd (boot) 2.5y old
WD blue HHD
Thermaltake smart 600 w psu 2.5y old

system worked fine Tuesday. Went to boot Wednesday and internals light up, case and gpu fans turn on, Corsair head stand lights up BUT no display and mouse and keyboard do not light up either.

ez bug display stays lit for “boot” and “vga”

I have disassembled and reassembled.
Boot without gpu
Boot with one ram
Removed mobo battery
Reset bios with CMOS connection
Changed sata cables for boot disk
Boot without ssd

none of the above worked or changed the result.

could it be PSU unit or maybe bad mobo?