I need help oc-ing a Duron 750

[Duron Jeremy]

I have a :

Duron 750 (blue core)
MSI K7T Pro2-A mobo
256 MB PC-133 Ram
20 GIG Maxtor
Diamond TNT2 Ultra
Soundblaster live value
48X CD-ROM
2X2X16 CD-Burner (I know it's slow)
56k modem

I have tried to o/c my processor, with no results. When I change the multiplier to anything other than 7.5, it hangs and won't post. I thought maybe I didn't unlock the L1 bridges correctly at first. I have tried a bunch of pencils, soldering, and finally a defogging kit. Still nothing works. I would hope that I could at least get my Duron to 800. It will let me adjust the FSB, but I would rather change the multiplier. Has anyone had any problems like this? Any ideas? Does this motherboard just suck? I'd appreciate your help

[quegyboe]

Have you tried raising your voltage? My Duron 800 wouldn't pass 850 without a voltage raise, but once I raised it, it went all the way to 1ghz! Give that a try if you haven't already!