The little green light on the back is on push the button noghthing happens
Open the case and ground yourself then:
1. Make sure all your expansion cards are seated well.
2. Make sure all your power plugs are ALL seated and seated well.
3. Make sure your RAM is seated well.
4. Make sure your front panel plugs are seated well and in the correct
spots.
(Basically make sure something above didn't come loose.)
5. Test the power supply or get it tested at a computer shop if none of
the above fixes it. Just because the green light comes on doesn't
mean it's not dead or dying.
6. Replace the CMOS Battery. (This is rare to stop a boot but it does
happen)
7. If none of the above reveals a solution then your motherboard is dead.
Good Luck!
SOURCE: Power doesn't turn on
Your answer might be here:
http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph06788&lc=en&cc=us&dlc=en&product=431078&os=228&rule=21100
SOURCE: Hav a pavilion a510n HP
I had a similar problem. Moved a 4-year-old desktop. Got the flashing light and no start. Quick fix is to unplug unit, open up case and unplug the large power connector on the motherboard. (On mine this is marked P1 and has a lock tab on one side that must be held in while unplugging.) Plug the 110-volt power and THEN plug the connector back into the motherboard. Button the case back up and all will be well until the next time you shut the power off to the computer.
The cause of this problem is likely that the battery on the motherboard is nearly dead. The flashing light is a warning to replace the battery. (It would have been nice if they would have put this into the user manual.) When you disconnect the power as described above, you interrupt the low-battery circuit. Replace the battery and all should be well.
SOURCE: HP computer doesn't turn on
Your power supply is bad--you will need to replace. I suggest looking at tigerdiect for a replacement.
SOURCE: computer wont turn on
i had the same problem its going to be your power supply it probably burned out. when i changed mine it worked perfectly.
SOURCE: I have an HP Pavilion a384x. It will not turn on
verify on the power suply is a switch with 2 positions 0 and 1
It must be positioned to 1
If not, the power supply could be damaged. It must be replaced
it could be a faulty switch or the bad lead connections
test all power and data leads that attach to your hard drive IDE SATA
MOTHERBOARD TO THE HARD DRIVE make sure they have secure dust free connections and are not faulty if its a flat ribbon 40pin ide
this will be the first to fail
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure dust free connections
a computer needs power and data to travel through every working device and continue its cycle and have a finishing point so any faulty leads will end up with a computer error
make sure the CPU has a secure dust free seating with thermal paste
make sure your ram modules are securely seated with no dust in the sockets also the Cmos battery has charge with no dust in the socket
on some motherboards cmos batteries are soldered in
hope this helps
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