My PS3 does the same thing. It turns on then doesn't do anything. I know my T.V.s and monitors are on the right channel. I know the cables work I've tried switching between hdmi and rgb always using the 2 beep reset, but the 2 beep reset stopped doing anything a while before my ps3 died. My ps3 died sometime in june or july, and I believe the power button stopped working 3 months prior.

 When my ps3 broke I was moving it from my HDTV to my regular TV. I had to call my cousin to change it's settings, but lines kept going across the screeen even after I got all the settings right. I tried my ps2 and ps1 cables no difference. So I went into linux to see if the lines showed up there to thats when my ps3 went black but it was still running I could hear it. I reset a few times and even tried the hard reset(2 beep/10 or 5 second reset) knowing it would do nothing. I've plugged and unpluged my PS3 put it into multiple displays with no luck. . I bought my PS3 in February off ebay it was brand new and closed. The guy gave me a reciet and he was a trusted or whatever seller. I'd bought a 360 two  months before in December it still works. Although I did play my ps3 more since I bought all the multi-player games on it. My warranty is over and sony wants $200 to fix it which I can't afford anymore.

My hard reset(2 beep) stopped working 3 months prior. I remember the update was over 70% done when I left and when I came back it said there was an error. I continued and it turned off but didn't restart. When I turned the power on it gave some  error message and told me to call tech support. The next morning I got up turned it on and it worked except for the hard reset(2 beep).