PJ,
Accepted wisdom is to remove the AC power, then remove the battery.
Now reconnect the battery and then the AC power.
Some information relating to LED codes
here - also a useful source for how to upgrade your BIOS - assuming that you can boot the damn thing!
If that doesn't cure it, your only recourse is a Toshiba repair. Or better still, buy a new laptop.
Toshiba really have gone downhill over the last 10 years - they used to be numero Uno in the portable world, now they are barely in the top 10.
SD