Issues Determining Failure to Boot

[TikPandora]

Hello everyone! I just installed some new hardware, and I'm definitely having troubles with it. (I sold all of my old stuff, so unfortunately I have no way to properly switch things out.)

 

Anyway, I purchased a new Enermax Revolution D.F 750W PSU for my system, as well as a used Asus Tuf Gaming B550m motherboard from BH Photo Video.

 

When I click the power button, everything turns on for a split second before it powers down, leaving only the power button itself and the motherboard RGB active. At first I thought it might be a bad PSU, but the paperclip trick showed that it powers on fine with a running fan and everything. I tried unseating and reseating RAM and checking all of my cables.

 

The CPU, RAM, and the storage devices are all known good parts, so that leaves me with the Motherboard. It came without an ASD bag just loose in the box and it has its fair share of scuffs. But as far as I know, turning on and immediately off is usually a power supply issue.

 

I'm going to start by buying a brand new (same model) motherboard.

[RONOTHAN##]

36 minutes ago, TikPandora said:

but the paperclip trick showed that it powers on fine with a running fan and everything.

The paperclip trick doesn't prove that the PSU is fully functional, it can only prove that the PSU is dead. I would be looking towards some other stuff but the PSU hasn't been eliminated from the running. 

 

Still, this sounds like short circuit protection tripping, likely somewhere on the motherboard. Run everything outside the case to make sure there wasn't a wire being pinched causing that short circuit or anything like that. Given you got the board used and beat up though, it's not impossible that it's an internal short circuit though and the board is just dead and you need to get a new one anyway.

[TikPandora]

I'm thinking I'm going to go ahead and just get a new MoBo and PSU and send these both back. The cables for the DF don't get along well with my case anyway.

[RONOTHAN##]

23 minutes ago, TikPandora said:

I'm thinking I'm going to go ahead and just get a new MoBo and PSU and send these both back. The cables for the DF don't get along well with my case anyway.

I'd definitely swap the mobo, PSU I'd be a bit less inclined to. If you still want to that's up to you, but personally I wouldn't bother.