The flashing lights on many of the Toshibas are a two-digit hexadecimal code: long = "1", short = "0", then convert to hex. So to isolate the problem, you need to identify the long and short flashes.
The 6100 got an extended warranty for a reason: it's a dog. If you're comfortable tinkering, then reseating the power board inside the laptop seems to help some people. Your best solution is to ask Toshiba if they'll fix it. They know it's a dog, too.