Out of the blue, my computer stops working and refuses to power up. Can anyone help?

So I am posting this on a Thursday night. Monday morning and night, my computer was working fine. Come Tuesday, however, and my computer won't turn on. I don't think much of it; I shrug it off and head to school. Come back from school, and the computer still does not turn on.
Now I get worried. So I:
1,) I make sure the cords are all secure and plugged in, which they were. The computer is plugged directly into the wall; it is not on a power strip. The green LED lights up when i reconnect thew power cord after disconnecting it. But, after I hit the power button, the computer flickers and the light turns off.
2.) I swap out the power cord on my computer eith the one for the monitor. Still no luck.
3.) My friends told me it just might be dust. So I removed the shell, and used a can of compressed air. MUCH dust came out. I put everything back together, and still the computer does not work; the same thing occurs as was before.
4.) Now I go through a much deeper cleaning, removing fans and cleaning it all by hand, still to no avail.
I have tried everything I know to fix this thing. Know I am reaching out to the community. Anyone have any advice/suggestions? Has anyone also run into this problem? I own and mainly use an HP Slimline s5310y. This is the computer that broke. It's a 64-but computer running the Windows 7 (64-Bit) OS. Any help at all would be greatly appreciated!

Hi,
Try this procedure and see if you can isolate the issue. Trouble Shooting Power Supply Issues. Don’t skip any steps.
HP DV9700, t9300, Nvidia 8600, 4GB, Crucial C300 128GB SSD
HP Photosmart Premium C309G, HP Photosmart 6520
HP Touchpad, HP Chromebook 11
Custom i7-4770k,Z-87, 8GB, Vertex 3 SSD, Samsung EVO SSD, Corsair HX650,GTX 760
Custom i7-4790k,Z-97, 16GB, Vertex 3 SSD, Plextor M.2 SSD, Samsung EVO SSD, Corsair HX650, GTX 660TI
Windows 7/8 UEFI/Legacy mode, MBR/GPT

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