Let's see if someone has seen this before: I upgraded ram in the empty slot of my pbook 17" 1.33, additional 512Mb from Centon. System became very unstable, Kernel panics, freezes, etc. Tested the ram...it was defective. So I brought the RAM back to the shop and got a new one. Installed it, System Profiler recognizes it, no more crashes, run a memory testing software called Rember, everything ok. So I think "great, got 1Gb working RAM now!!". Until this morning. I left the pbook in sleep overnight (as always), connected to power supply and when I opened it up this morning.....NOTHING. I get a blank screen. I hear the fans very silently run in the background and a little HD movement, but nothing happens. The only way to get it working is force a reboot with the power button. So I am wondering....is this this a RAM problem? I still have a couple of days warranty if I want to return it and get the money back. Have you ever seen this before? Any thoughts/suggestions more than welcome!!