Unplug it and let it sit for a couple of hours. Plug back in and turn on. If the date and time are incorrect, replace the battery. Next boot with just one stick of RAM at a time and see if you still get kernel panics. Does your serial number fall within this range:
Serial Number ranges:
W8435xxxxxx – W8522xxxxxx
QP435xxxxxx – QP522xxxxxx
CK435xxxxxx – CK522xxxxxx
YD435xxxxxx – YD522xxxxxx