HP pavilion will not post

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Hi everyone,
I own a HP pavilion a1240n
Mobo goldfish3
socket 775
Recently when I switched on PC the os would not boot up.
I checked PSU, the -5v was not working so I installed new one.
I am still having same issue, all fans are coming on.
Another point is that the led behind the power switch is not coming on.
I am sure there is issue with MOBO but is there a way of checking it without having to replace it, I presume I will have to replace OS if I have to get a new board.
I am based in Ireland so there will be time differance lag between answers
 
Try clearing the CMOS by removing the lithium battery on the motherboard.
 
Sorry about delay in reply.
Thanks for your suggestion cfitzarl.
I have tried what you suggested but still no joy.
Any other Ideas?
 
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