Power boot up problems

Question

I seem to have a problem that quite a few people have mentioned (but no working solution has been found that I can find).

After plugging everything in and then flicking the power switch on my power supply (not on the PC box) all the fans start up but it seems like nobody is at home. No beeps and only one green light on the box that doesn't flash or flicker. Monitor doesn't register anything and no POST or bios information shows up.

My specs are:

Asrock AM2NF3-VSTA MotherboardAMD Athlon 64 X2 4600+ Windsor 2.4GHzELSA GLADIAC 776 GT AGP 256MB (7600 GT)1GB PGI DDR2-667 RAM (667MHz)1GB DDR2 PC2-6400 Elixir (800MHz)Western Digital 160GB HHDENERMAX EG365P-VE FMA 1.3 ATX12V 350W Power Supply
I bought the board because my AGP is still strong enough for what I need but I wanted to start using a 64 bit processor.

I've tried switching RAM sticks and slots and using only one chip and but no change. The power seems to start up as soon as the PS is switched on. Holding down the power button on the box does't shut it down and the reset button doesn't seem to have any effect either.

Any help would be appreciated!