Try resetting your p-ram. Rebot holding down Apple+Opt+P+R and keep it held down until it chimes for the second time (after the initial startup chime, it'll hang with apparently no activity for a few moments, then chime again). Let it do that a couple of times.
Failing that, I (and Apple Support) would suggest removing any RAM that didn't come with your Mac. OS X is very sensitive to memory problems, and often kernel panics when the memory is going bad. Try removing any of your third party ram and booting again.
Be sure to post back to let us know if it works, otherwise we can suggest other courses of action.
They say if you play a Windows disk backwards, you hear demonic chanting. That's nothing. If you play it forwards, it installs Windows.
btw...it's just pronounced "Randy". The 3 is silent. For no good reason.