PB 15" won't Boot/Loses Date & Time

I have a 15" PB 15" that runs fine for a few days on either battery or AC, then suddenly won't boot (apple logo w/spinning gear). I can get it running again after running Disk Warrior (from a Fire Wire drive), but notice that when booting from that FW drive that a message pops up informing me that date & time was set to a date prior to 2001. Anyhow, after rebuilding by DW, the system runs fine for a few days, but then reverts back to the same problem.
I should note that after booting from the FW drive, and before running DW, I could not run Disk Utility on the problem MacintoshHD because, while it showed the drive, Permission Repair was greyed out, not allowing me to access the problem drive. Sustem does, BTW, boot from CD also. The fact that it boots from CD and FireWire drives leads me to believe that the internal HD is my problem. I'm scared. however, about the message that date & time was changed at the time of failure.
Would (or could) the date & time be lost if problem was limited to the HD ? I ordered a new HD, and hope that the problem is not the Logic Board. FWIW, I have done the PMU reset procedure, and that didn't solve anything.

Okay, it seems the problem is resolved, and the cause seems to have been a bad 256Mb DIMM. At least that's all I can imagine it was. I still hadn't gotten around to replacing the HDD nor the clock battery. While waiting to receive these two parts, I removed the replaced the second memory DIMM (a 256Mb) with a 1GB. and it's been running about a week with no problems. (I even accidentally dropped the PB yesterday, and it's STILL functioning fine. I can only imagine that the 256 DIMM was flaky, yet passing all diagnostics. Maybe the loss of date & time problem was caused by the machine not having been used for a long time prior to my purchase a few weeks ago. (Is that battery a re-chargable one?) Maybe now that I have the machine on each day, it remains charged enough to hold the data.
Anyhow, I'm going to upgrade the HDD from 80 to 160 and hold onto the spare clock battery just in case. Thanks for the help guys. Walt

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