non booting toshiba p15-s470 laptop, inconsistent symptomsLocked
I was hoping that someone might have encountered a similar problem to the one I’m having with my laptop & might have some advice.
PC is running XP sp2, BIOS is already flashed to most recent version (2.0), not getting any POST beeps,
I have a 3 year old toshiba p15-s470 that is 2 months out of warranty. The problem started when the PC froze & I had to do a hard power down on it instead of shutting down. After the shut down it wouldn’t boot back up. When trying to power it on it does one of several things:
1. power light comes on, but pc immediately shuts back off.
2. splash screen comes up, but locks up there
3. partially boots into windows & locks up during startup.
4. Boots all the way into my desktop & immediately locks up.
5. Power light comes on, nothing else happens, screen remains dark.
I know this is nonsensical, however it seems that the longer I leave the laptop unplugged with the battery out the further it boots, which would make me think it is overheating, however I cleaned the heatsinks last week & the fans spin up when I power on. When leaving the power & battery out of the PC & turning it back on as part of the PC’s diagnostics check I get a CMOS checksum error as the battery has completely discharged, however I can clear this by entering BIOS setup & exiting BIOS while saving changes.
Here are the troubleshooting steps I’ve taken to try to resolve/isolate the problem.
1. switched out RAM chips for older, known working chips. Also tried booting with only 1 chip in each slot. No change.
2. removed CD/DVD drive & booting. No change.
3. removed HD & tried booting. No Change, didn’t get as far as saying HD not found.
4. Used HD in enclosure in another PC & was able to run chkdsk & virus scan. No problems, no virus. While in other PC I can access all files on HD.
5. Removed Wireless NIC & booted. No Change.
6. Booted with no battery, only AC. No Change.
7. Tried booting into windows recovery console to perform fixmbr & fixboot, however pc locks up before I can get that far.
My thought is that its got a bad mobo, which wouldn’t be worth fixing in a 3 year old PC. I wanted to try changing the battery on the mobo, but I’m not sure if it integrated or not.