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Here's what the tech did to fix mine with the same problem:
Unplug the power cord and remove the battery. Hold down the power button for 20 to 30 seconds. This completely drains the pcb mounted capacitors and is similar to a hard reset. Put the battery back in, plug it back up, and start it up. Worked like a charm, and didn't cost me anything. Something in the residual memory was causing the problem. I've since seen this fix several Toshiba laptops with the same problem. Good luck, and God bless!