Question HP Pavilion PSU replacement 4 pin only

[nikd0]

Hello,
I have problem turning on my HP Pavilion 690-0006nc -- sometimes pressing power button ten or hundred times, nothing happens, especially after turning power on, when it turns on it runs seamlessly . Probably the power supply is dying, it makes strange sounds (electronic, not fan).
I am looking for new PSU to test/replace, but the motherboard does not have 20(24) pin connector, there is only 4 pin MB + 4 pin CPU. What shoud I look for? Is it some atypical HP PSU+MB?

 

[JohnBonhamsGhost]

proprietary power supply + motherboard.
standard retail versions are not compatible.
you can either contact HP or try searching for specific replacement parts on eBay, Amazon, and other HP parts sellers.

you should look for any serial or parts number and search for that
and/or take exact measurements and compare available models with those and the connections needed.