Trouble upgrading a Zip GS

[livepoet@together.net (Kevin Smith)]

I've had some trouble while performing upgrades on my ZipGS card.  So
far, what I've done is replaced the processor with the 14Mhz one from
WDC, gave it a faster cache, and put in a 64Mhz oscillator.  However,
when I turn on the computer, it doesn't boot up.  The upper left part
of the screen is black, and the bottom right part is a blocky white
shape.  I have a Focus harddrive card, and I can see its activity
light go on when I turn the computer on, and it goes on each time I
reset with control-apple-reset.

What could be causing the problem?  Is the oscillator too fast?  Do I
need a stronger power supply to support the extra speed?