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PC won't boot after OC. Motherboard the cause?

post #1 of 14
Thread Starter 
Hello, I'm new here. Apologies if this thread is in the wrong location, I wasn't so sure.

System Specification

OEM: Advent Centurion CBE1401

CPU: AMD Phenom 550 X2 Black-Edition (Factory Clocked @ 3.40Ghz)
GPU: ATI Radeon 5670 HD
RAM: 4GB DDR-2 @ 800Mhz
HDD: 1TB Western Digital SATA
Motherboard: Foxconn A7VMX-K
Chipset: AMD 780V
PSU: Channel Well Technology (550W)

Just incase you're wondering about the PSU, the machine is sold with 450W but I added the 550W myself. Same with the HDD.


Well Ive come across a very frustrating problem which occured yesterday evening. Anyways, I wanted to see how far I could push my CPU before it became unstable on stock voltages etc. My method of doing so was within the BIOS by modifying the CPU Multiplier. Each time I would increase the multiplier by the above available, save & boot. After each one I ran prime95 for 25-30minutes (I know .. please don't tell me that I should test longer etc etc, Ive heard enough already) Anyhow each step I taken surprisingly handled it for 30minutes. It wasn't up until I reached the 3.90Ghz mark again saved & rebooted I remember a message at the top left of the screen appearing which I was so stupid to not remember what it said. It would stay on this message & would not change. I then just held the PC switch in until it powered down & again powered up... this is where the problem came... I heard no beep like usual and the screen stayed completely blank.

Please note here that each time I was closely monitoring my temperatures! At 3.80 the CPU did not breach 45c whilst on full load for 30minutes.

What baffles me is that when I first received the machine I stupidly went straight ahead for 4.0Ghz (Newbie overclocker) but instead it just gave me a BSOD and all I had to do was turn down the multiplier to fix it, not DESTROY IT .

Anyways, I assumed that I should revert the BIOS and as I could not find the motherboard jumper I went ahead and safely removed the CMOS battery. Of course, I completely powered down the machine.. even went as far as removing the PSU connectors to the motherboard. I left it for around 5-10minutes. I then put everything back together and still the same thing occuring.

Later on, I came accross the jumper.. seriously don't know how I didn't notice it before, it was right infront of me . Anyways, I pulled up the jumper and swapped it over. Again powered up and the same occurance.

Basically when I power on, all my fans are running including any lights. My HDD is spinning, CD/DVD drive opens and closes as usual.. even my router is registering my ethernet cable connected. But theres no beep and nothing is displayed and it will sit like this for hours..

Ive even changed the CMOS battery for a completely brand new one.

Honestly, I'm actually hoping it has killed the motherboard only or worst to come all of the components .. Ive been looking for an excuse for a long time now to change it so that I can possible unlock the 2 cores available on the CPU.


I'll appreciate any comments, but rather than telling me how much of an idiot I am, and believe me I know it!. I'd prefer a good explanation as to how this has occured and maybe a possible fix but I doubt it.

I hope I haven't bored you already but thank you in advance, I'll be happy to provide more information if requested/needed. Again the notes below are just little bits of info. I think you might need or may not.

Notes (just to keep in mind)

Ive analysed the CPU and cannot see any visual damage on the CPU nor any of the components for that matter.

Ive borrowed a 600W PSU from a friend (although Ive never heard of the brand lol) and still no results.
Edited by pprest123 - 4/19/11 at 12:07am
post #2 of 14
Sounds like mobo-what brand is it?If it is an aftermarket board-you couldn't have killed it by what you did.If it is an O.E.M. board,one of the VRM's are probably dead.
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Amelia
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post #3 of 14
Thread Starter 
The brand is Foxconn, I also put put this within the system spec above.
post #4 of 14
have you tired to boot the PC then press the reset button 3 times.
if that don't work the only way is to piece your whole system out and reassemble it , preferably not in the case.
some times it could be just something silly like the MB screws are to tight lol
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post #5 of 14
Thread Starter 
Hi, I have already tried that Blackmoth. It would just powerup but no beep and monitor would continue to stay blank. In terms of pressing the reset button... the tower didn't come with a reset button lol just the power on.
Edited by pprest123 - 4/19/11 at 12:56am
post #6 of 14
Sounds like the board is dead, prolly VRM problem.

the quick fix is to check all the Mobo connections again (this includes that jumper you swiched), check the RAM (seated right and one stick at a time),
then check it all again (take your time, be methodical).

Cleaning all the connections is a good Idea too (make sure you are earthed doing this).

Failing all that, An AM2+ Mobo can be purchased for very few bucks nowadays (here in OZ less than $50 for an ATX and less than $40 for a mATX), they will still have DDR2 so you don't have to buy new RAM as well (and of course every thing else will fit).

Or it's time for an upgrade (more expensive but more fun too).
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post #7 of 14
Thread Starter 
Quote:
Originally Posted by Redwoodz View Post
Sounds like mobo-what brand is it?If it is an aftermarket board-you couldn't have killed it by what you did.If it is an O.E.M. board,one of the VRM's are probably dead.

Odd, correct me if wrong but from my knowledge if a VRM is dead it wouldn't power on at all?
post #8 of 14
3+1 phase... not exactly of good quality... not a bad diagnostic
See if the motherboard boots without the 4-pin/8-pin CPU power connector plugged

If it boots, VRMs went fry
post #9 of 14
Thread Starter 
I tried that & it powered up so I guess we can say the board is dead at the least. Although when I tried this I had no components connected to the board other than the PSU ... I assume this won't make a difference.l
post #10 of 14
Does it smell like anything has burnt out? Like a smokey smell?

I would try pulling it apart and putting it back together bit by bit
 
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