Motherboard won't POST and gets stuck in an endless reboot loop.

Lollies

Reputable
Jul 17, 2014
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4,510
Hello everyone. I've come here because I'm all out of ideas and I would really appreciate it if you guys could help me.

What happened: I was using my PC as usual and then, one day, when I was going to turn it on it just wouldn't. It wouldn't even give me an error. I could hear the PSU trying to start each time and failing. I started trying all of the answers posted in the internet, including the long list that's posted here each time someone has one of these problems. I tested my PSU and it would work just fine so I took my motherboard out and tested it with the bare minimum plugged in. After a while of testing I figured out everything would "work" as long as the CPU power wasn't connected, even if I plugged in all of my components (including ym power-hungry graphics card) but, as soon as I tried to plug in the CPU power, it would go back to the endless reboot loop.

That I can think of right now, I've tried the following things.

-Connecting the bare minimum components.
-Trying a different PSU, same problem and I'm sure that was a good PSU since it was powering a different PC.
-Resetting the CMOS-swapping the CMOS battery.
-Checking for blown capacitors/damaged parts/possible shorts.
-Checking the CPU and its socket for any kind of dust/damage.
-Swapping between four different memory sticks.
-Jumping the PSU, works flawlessly.
-Reseating everything.

I've documented the situation in a video where I first try to turn my PC on with the bare minimum components and it just refuses to start and then I plug out the CPU power and all of the fans start working.

https://www.youtube.com/watch?v=C24h8CKrHOU

I'm guessing things point to a motherboard problem but I want to try anything you guys can suggest because I don't live in the US and sendind my motherboard for an RMA could take months and could cost around $100 which is kind of a bummer for me. Any ideas :)?

Any and every kind of help is deeply appreciated!

P. S.: Right now I'm trying something a guy suggested here which was taking the CMOS battery out and waiting around an hour before plugging it back in.
 

danielbsipe

Honorable
Aug 14, 2012
221
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10,760
I had the same problem, except the CPU error LED was lit on the board as well (it was a z97 sabertooth mark 2). I did all of the of the same diagnostics that you did, and even dropped the cpu into a different z97 build. Turns out I had a dead board. I don't know if you have another board available, you should try to test that board, but I would say that process of elimination suggests your board is dead. Do you have an active warranty?
 

Lollies

Reputable
Jul 17, 2014
18
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4,510


Yeah! Luckily my board has a 3 year warranty that's still active. I really wanted to avoid using it since, like I said in the OP, I live outside the US and the warranty process could take a whole lot of time and money. I'm starting to think that's the only way out of this ):.



I did try a different PSU and it had the same symptoms. About the CPU, I guess I'll have to do just that but it's pretty hard to come by a place that'll help me do it since the country I live in is not exactly a highlydeveloped one in terms of the tech industry. I'll have to try and see if I can find someone who helps me either test my CPU in another board or test my board with another CPU before I try to RMA it. Thanks for the suggestion!