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No Signal - Upgrade following dead mobo

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#1 mortyb


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Posted 26 July 2018 - 03:46 PM

Here is my problem. My son's PC was working perfectly and after a spark and a pop from it it would not send a signal to the monitor.

Tried various cables and monitors and no joy. Checked the Mobo and saw the atx power connecter was burnt on both PSU connector and mobo.

So bought new pre-built and tested mobo and processor bundle, re built it all and still having same problem!!

Took out the GPU and tried it with the on board graphics card. Same problem!!

The PSU seems to be working fine (unplugged burnt connector) and everything is whirring away and LED's are lit up. By process of elimination I'm thinking it could be the PSU. Getting "no signal" whatsoever to any monitor or tv.

I have even tried just using using just one ram stick at a time.

Current system.


Edited by hamluis, 26 July 2018 - 03:54 PM.
Moved from Buying New to Internal Hardware - Hamluis.

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#2 Chris Cosgrove

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Posted 26 July 2018 - 05:57 PM


the atx power connecter was burnt on both PSU connector and mobo


Unfortunately this is what is called a 'catastrophic failure' and you are definitely correct to replace the mobo but I would replace the PSU as well but it is possible the damage didn't stop there.


Is there any way you could try the RAM sticks in another computer, they too could have been fried ?  Failing that, see if you can lay your hands on another RAM stick, even 2GB would be enough to get most OS running, perhaps not well but running.


To do this amount of damage either something went dead short on your mobo, causing a major current surge which did the damage, or your PSU generated a major voltage overload which caused the increased current which did the damage. If it was the PSU which caused this current surge then anything connected to it could also be damaged. But test the RAM first or try a different stick.


Chris Cosgrove

#3 mortyb

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Posted 28 July 2018 - 11:20 AM

Thanks Chris, that's sound advice. I've put in a brand new PSU and still the same. I don't have another RAM stick to try so have ordered a new 8gb stick.


Once that is in the whole system is essentially brand new.


Should the mobo beep when powered up as it isn't. I doubt very much the new mobo is faulty as it was pre built with the new processor and tested prior to shipping.


Thanks again for your help.



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