CrookedBarrel wrote:What I would do is verify the motherboard works by running outside of the computer case, with nothing but PSU(Power Supply Unit), RAM(Won't boot without it) and CPU(with cooler) installed(No graphics card, no harddrive, etc..). Don't plug in anything but the power cord to the PSU; No screen, keyboard, etc.. Make sure you place the motherboard on a non-conductive surface.
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i have already done that. The CPU would spin-up, then the (new) power unit makes a sound and everything goes dead.
The MoBo has a button to power it up.
The CPU us a i5-3470 (LGA1155, no old-school pins btw) and the MoBo is the ASrock Z77 extreme 4 Mobo.
Nothing visual wrong the CPU.
I have an older motherboard (other socket) and both power units power it is. So they are working for sure.
Assuming the new MoBo is not broken out of the box it has to be the CPU. But I never encountered a similar error with the CPU.
Some wonky bluescreens or at least a madly peeping internal speaker, but never just staying dead.