Help required for a real odd issue

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Joined
9 Nov 2003
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1,517
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nr Exeter
Really need some help with this problem(s) so hopefully someone will be able to suggest what to try next. I was playing world of warplanes and the pc locked up when I added a xbox 360 wired controller. No problems I though and reset the pc....

PC will not boot, beep but fans spin and led's light up on the motherboad. So removing components one at a time from the motherboard and still no beep.

Tried booting with and without graphics card and with 1 stick of ram and no ram - no beeps

Reseated CPU and heatsink - same behavior

Reset cmos and removed battery while powered down.

All voltages testing fine on the PSU with a multimeter.

Replaced the motherboard and cpu as I thought it must be one or the other with a brand new gigabyte 1150 board and i5.

Removed motherboard and components from the case - still nothing

Same thing.

I have tested the ram in another pc and that's working fine. I cannot test the GPU but when I remove this from the motherboard it makes no difference.

My only thoughts at this point are;

1, maybe I have received another faulty motherboard/cpu

2, there's something funky going on with the connections in the case.


Hardware

Original motherboard - Asus M5A97 pro AM3+
CPU - AMD fx 4100
8gb ram 2 x 4gb kinston hyper x 1600mhz
MSI Radeon HD 7850
PSU - OCZ 700w modular

New motherboard & CPU

Gigabyte Z87 HD3 1150
Cpu intel i5 4670k

Advice very welcome at this point, i'm no newbie with building pc's I have been at it for 20+ years. Have built a watercooled pc a few years ago as a project. The only time I have had something similar to this was a fluctuating 3.3v rail on a crappy thermaltake psu, but the pc would boot but crash.
 
I once had a psu that wouldn't boot the fans just kept spinning up and down.

but it was only on a cold boot, reboots were fine.
I had to press the power button , then press the reset button at the right time for it to boot.

maybe trying faffing with the buttons the psu is probably dodgy

did you check if any of the motherboard stand-offs are in the wrong place and shorting the board?
 
Checked the stand offs when changing board + its the same out of the case. PSU voltages are testing fine, checked all rails and everything is as it should be, unless the voltages are wandering around of course.
 
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