Did you replace the battery? If you did, did you repalce it with a genuine Toshiba battery? Generic batteries often do not work, or do not last. I only recommend genuine brand name batteries. Either the battery is not making contact with the mainboard, or your battery is bad.
Lithium batteries if left for a long time without charging can go into protect mode, if this happens you will need to buy a new battery. I did this to a Mac battery after it sat for over a year without use, the battery would no longer charge. I only had about 140 cycles on the battery and it held a 99% charge before this.
Low voltage is dangerous for lithium batteries which is why they have this protect circuit built in. Over volt or under volt will essentially disable the battery.
Edited by zingo156, 13 May 2014 - 07:53 AM.