I think 2 Motherboards taken out. could it be PSU? CPU?

G

Gaz25

Geek Trainee
ok long story from from the beginning.

I was building a media center pc which had an ASROCK P4VM890 Motherboard. Most of the parts come from ebay and becuase i didn't have my new case yet i wanted to check the parts work so i slung them in an old case. Everything went in ok and worked a treat. The new case arrived so i took everything out from the old case and into the new. I also had ordered a new MATX PSU. I switched the PC on and got nothing on the screen. HDD starts up, CD rom starts up, PSU and CPU HS Fans all spin. So i done the process of elimination and striped the machine down to just the MB, cpu, ram and PSU. Still the same problem. So i changed the PSU to the one that did work with the system. Still nothing. So i removed the motherboard from the case and put it onto a cardboard box (MB Box). Still the same fault. From this i assumed either the motherboard had gone or the cpu and because i never touched the cpu when moving to the new case i assumed it was the motherboard.

Went to my local PC World and found the last P4 MB in stock and it turned out to be the exact model. So i took it home and installed the new motherboard. With the motherboard on the MB Box, i switched the pc on and it worked!!! I then did the following.

Put the motherboard back in the case - Still switched on ok.
Changed to the new MATX PSU - Still switched on ok.
Connected HDD, CDRom etc.. - Still switched on ok.

So after this i thought YAY pc works. It installed windows fine and i left it running to get all the updates. With windows updates, Antivirus and firewall, the pc had to restart a few times but on the final restart i got the original problem back. I now have no display on the screen.

So has anyone got any ideas as to what the problem could be? I looked over the old motherboard and could not see anything physically wrong with it.
 
It could be a loose connector. Just this Christmas i got a new case and psu.
first it worked then it didn't. I took it apart jiggled everything, but still nothing. so i took a closer look at the cable connecting to the mobo. it had extra pins being a powersupply that could support a 28pin board or something like that :D so i bent back the extra pins and i realised it was getting caught on a componant on the mobo. now it goes in properly and starts up :D
hope this helps.
 
Has the system started properly since, that is after cooling down?
Obviously I'm thinking it could be due to airflow through your new case and a seperate problem from the one you originally experienced.
Does the sys POST ok?
 
Sorry for the late reply. I have found the problem. On most motherboards you have the goldish colour spacers that stops the motherboard from touching the case... otherwise it would short out. Will this case has one space and the rest are like little domes protruding from the case. Anyway this case said it supported MATX motherboards, little did i notice that there was an extra dome/spacer which must have been shorting on the motherboard, i fliped the motherboard over and saw some lovely crushed capacitors! I took the motherboard pack to the shop and just said it didn't work and they replaced it with a new one. I had file down the extra dome/spacer. Now the system works fine.... well sort of. See my post about dvd drive corrupting the dispaly and crashing the PC (in the storage device section of the forum.

Thanks all for the replies and help :D
 
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