Power Up Troubles

Okay, first...the specs:

Lian Li PC61
MSI K9A2 Platinum 790FX
AMD Athlon 64 X2 5000+ Black Edition
Xigmatek S1283 Rifle CPU Cooler
Corsair HX520W
4GB OCZ SLI-Edition DDR2 800
Visiontek 4850
WD Caviar 250GB
X-Fi XtremeMusic
D-Link USB Hub (powering mouse, keyboard, canon printer and cell phone)
Samsung 17" 740n

So recently (like within the last week), I have found that when I power down the computer and then later on return, the computer does not power up. I push the power switch, but nothing happens. All cables appear to be properly connected and are securely connected. I have not made any hardware modifications since installing my 4850 about 2 months ago. The PC works perfectly fine when powered up.

When the computer has not powered up after pushing the start button, I have simply flipped the PSU switch, waited a few minutes, flipped the PSU switch back and then powered up. Today, however, that didn't work immediately. I took me about 10 attempts.

I have had this PSU for about a year and a half. Wondering if its dying or something. I can't explain the issues, but like I said...when its on...everything works great!

Whoa...screwdriver to jump it? How do I do that exactly?

And yes, I am performing the correct procedure for shutting down a PC, right from Windows. This is not a new build, but this a very new problem.

Once the pc starts remove the screwdriver.

if the pc still will not restart normally i would gamble on the faulty mobo. since the system works once it's started I don't think it would be the PSU.