HP desktop wont power on!! Help!

Idk if this belongs here but seems like the best place. But anyways~ I bought a HP Pavilion Slimline s5220y no more then 2years ago. I had no real problem until today. I noticed the power light was on and thought my screen was just asleep but my keyboard didnt have power going to it.
I forced restarted it. when I power it back on the power light comes on but doesnt power up.
I took off the case and tried to power it up again. My fans move a tad bit when i turn it on but stop after. I swapped power cords and still the same thing.

I tired to to unplug the power cord and hold the power button for 10secs. but nothing.

any idea what it could be? or what needs to be replaced?

JaidynM said:

Can you boot into BIOS? If not, your PSU might be dead.

Normally i cant. But when I do that power drain thing and boot it up it will boot up for a while but then shut off. So I unplug it and hold the power button down again and i can boot it up again but shuts off after awhile.

Classic dead PSU or motherboard symptoms. I would start with the power supply, as that is what I suspect right off the bat.

Newegg.com - SeaSonic SS-300TFX Bronze 300W TFX12V v2.3 80 PLUS BRONZE Certified Active PFC Power Supply - Power Supplies

This one has gotten good reviews, and is the size you need.

Oh ok thank you! I hope its just my power supply. If it isnt then how much would it cost to replace the motherboard?

Ok I guess for now ill just order the PSU that you suggested. Just to make sure, it will fit right?

-research completed- Your motherboard (direct replacement) would cost 175 dollars. Just as an off question, do you have a spare PSU you could get ahold of (the size doesn't matter, it's not going to be actually installed)

I could take the PSU out of my mothers Dell. The power cord seemed to be the same.

Ok so I take my dell PSU and hook it up to my HP hard drive and motherboard?