Wont start up/ board led lit

[PAT31850]

Have a Asus a7v133 in an Enlight case that has problem starting up. Problem getting worse. Hit sart button and sometimes nothing. Opened up and checked switch/appears ok plugged back in -nothing, board LED on. Let sit and bingo it started. No problem once it is running. Problem seems to be more frequent and lasts longer before it will start.
Any ideas?

 

[o1die]

I would reinstall everything. Take it all out and put it back together, in case something is grounded or a connection is loose. How old is your power supply? If over 3 years, check out fry's.com for an ultra 500w free after $40 rebate. The rebate may have expired by now.