Getting my P4 beyond 2.2

[ss109]

I currently have a 1.9GHz P4 running 2.2GHz @ 1.8v, Swiftech MXC478 heatsink, artic paste, 1 fan in, 3 fans out. If I try 2.3GHz, I cannot boot past BIOS (into Windows). How can I get past this point? This si my first o/c project in a long while, so I'm not completly up-to-date on the latest techniques. We use to do stuff like sanding down the processors to get a better surface area (on K62s and Celerys), etc. Is the P4 safe to sand on, as it has a little chip in the top center? Any air-cooled ideas are appreciated! TIA

[el]

Welcome to the forums. have you tried increasing the vcore? I might try posting this in the intel cpu section as they might have a better idea. the highest I have seen a 2ghz p4 is 2.4 so you might be pushing that chip pretty hard.