Intel DP45SG and Q9550 overclocking won't boot


I tried to overclock my Q9550 CPU running on Intel DP45SG Motherboard with factory BIOS, I never upgraded the BIOS.
I used Intel Desktop Control Center (IDCC. XP SP3) and changed settings from 333 to 500 and from 1.16 something to 1.3, the software asked me to reboot, I rebooted and since then the box won't come back up.
I tried to reset the BIOS in several ways:
1. removed the battery and wait 1 hour - didn't help
2. used the CMOS jumper to clear the bios from - didn't help
3. tried the recovery from - didn't help

Still, when I turn on the box, fans move, I can here the hard drive start, but I get blank screen, no POST beeps - nothing. just this blank screen.

Any help please!
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  1. Update:
    I managed to reset the bios.
    cmos jumper in clear mode, bios jumper in maintenance mode, turn on, wait 30 seconds and viola!
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