PC won't boot after mother board & cpu upgrade.

  • Thread starter Thread starter Steve Silverman
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Steve Silverman

Having upgraded my PC today, I decided to transfer the old cpu and mother
board to my daughter's computer, together with a new graphics card and power
supply.

Unfortunately, it now doesn't want to boot. When the power button is
pressed, the CPU fan spins for about a second, then everything dies. I've
double, triple and quadruple-checked the connections, and I've eliminated
the PSU from the equation by trying two others.

Any ideas anyone?

Steve Silverman
 
Having upgraded my PC today, I decided to transfer the old cpu and mother
board to my daughter's computer, together with a new graphics card and power
supply.

Unfortunately, it now doesn't want to boot. When the power button is
pressed, the CPU fan spins for about a second, then everything dies. I've
double, triple and quadruple-checked the connections, and I've eliminated
the PSU from the equation by trying two others.

Any ideas anyone?

Steve Silverman
Click to expand...

Is the mother board shorting to the case?



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Unfortunately, it now doesn't want to boot. When the power button is
pressed, the CPU fan spins for about a second, then everything dies. I've
double, triple and quadruple-checked the connections, and I've eliminated
the PSU from the equation by trying two others.

Any ideas anyone?

Steve Silverman
Click to expand...

Look closely again at where the cpu fan is connected. Often there are
two very similar fan connectors. One for the cpu, the other for the
chassis fan. Easy to get the wrong one.
 
Look closely again at where the cpu fan is connected. Often there are
two very similar fan connectors. One for the cpu, the other for the
chassis fan. Easy to get the wrong one.
Click to expand...

Good call.And on some mother boards putting the CPU fan on wrong
connector/header will cause the fault effect as a protection system as
the BIOS does not detect the CPU fan and thus shuts down the system to
prevent CPU overheating.My,"Asrock" board has this function.



--
Free Windows/PC help,
http://www.geocities.com/sheppola/trouble.html
remove obvious to reply
email (e-mail address removed)
Free songs to download and,"BURN" :O)
http://www.soundclick.com/bands/8/nomessiahsmusic.htm
 
Look closely again at where the cpu fan is connected. Often there are
two very similar fan connectors. One for the cpu, the other for the
chassis fan. Easy to get the wrong one.
Click to expand...

It's definitely not that. I've transferred a working CPU and mother board
form one PC to another without disconnecting the components.

Steve Silverman
 
Shep© said:
Check the mounting screws thru the board are not askew.
Also take the board out and power it up if you can and see if the fan
keeps going ?
Click to expand...

Bingo! I removed one of the screws that had gone in slightly awkwardly and
it booted up immediately. Many thanks.

Steve Silverman
 
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