PC won't boot: fans stop spinning at start up!

Hi all
I have a Compaq CQ5335fr that worked just fine for a few years (3).
Then one day, it went off suddenly and wouldn't boot any more:
When I power it up, fans (CPU and chassis) start spinning for 15 seconds then they stop spinning. Only GPU fan keeps spinning. I have still blue and amber lights in the front of the desktop.
I usually push the power up button until it powers off. Then when I restart, same thing!
I tried the following with NO SUCCESS:
- clean & dust parts
- Reset CMOS
- Bought another PSU
- Played with DIMMS (put one by one, inverted etc.)
- Unplugged all components and replug one by one
- And a couple of other desperate things
- Put the hard drive in another computer to check if data are there: OK (although had "cant' access" errors in the beginning
Nothing worked.
NOW I NEED YOUR HELP TO LOCATE THE ISSUE IN ORDER TO SOLVE IT!
Thank you in advance.
This question was solved.
View Solution.

Hello again Moyiize.
I can't safely say if other motherboards would work or not. However, you should be able to get the same motherboard through HP. Here is a link to your computer's HP Part Surfer page. You should be able to order it there.
If you want to say thanks make sure to click the white star under my name to give me Kudos. I really appreciate it!
I hope you have a great evening.
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Click the "Accept as Solution" button if I resolve your issue.

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