I have a P3 I'm trying to upgrade the RAM on. HP Pavilion, came with 256.. Trying to add an additional 256. BIOS reads the chip, but system won't boot.. just continually restarts non stop.. I checked creep, I even reversed the chips and still nothing. Removed the new out of package chip and the system works again. Place the new RAM in by it self, system works.. So is it possible that one slot is dead?