razlken:

Are you running firmware 3.41 on the PS3? That is the only version that works.

Are you getting 3 beeps? I had this issue when I would flick the power switch (from total power off, not the power touch pad) and quickly press eject. The fan would run and I'd get 3 beeps and it would shut off again.

You need to press eject FAST, within 200ms some people have said. Press them both at nearly the same time.

Let me know if you're still having the issue. (It *will* take around 10-15 seconds sometimes to boot up.)