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|6th November 2007, 17:18||#1|
PC won't boot: Psu or Mobo?
At the moment i have disconnected everything from the motherboard. There's only the cpu + cooler, memory and 1 fan
Now when I connect only the 20 Pin ATX cable with the Motherboard and i try to boot, the fan and the cpu fan begin to work.
However when i try to boot with the 12V connector (for the CPU) everything remains dead
Last edited by Indizann : 6th November 2007 at 17:56.
|6th November 2007, 17:26||#2|
Join Date: May 2002
with 12V connector do you mean the 3-pin fan connector, a 4-pin E-ATX connector or 8-pin EATX connector?
If it's one of the last two, get a hold of a second test PSU, if it's the first, try another fan header?
|7th November 2007, 07:52||#5|
If the 4-pin connector isn't connected, does the computer boot or just sits there doing nothing ?
If you can't find a second psu, you could try measuring the voltages using a multimeter, anything between 11.4V and 12.6V on the 12V rail is acceptable.
|25th December 2007, 02:56||#7|
There are some Gigabyte motherboard (P965) which have re-boot issues and disconnecting the 12V P4 cable seems to resolve the issue. This tuitorial on PSU connectors provides everything you need to know. Why there is a 4-pin 12V connector for additional power to the processor (known as P4 connector) and why some boards use an 8-pin 12V connector (known as EPS12V).
The photo below shows a Gigabyte board and the P4 CPU connector.
Last edited by Liquid3D : 25th December 2007 at 02:58.
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