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I am using my TP755CD in our van and supply the power via an inverter and the 115 volt power brick. Several days ago, the machine beeped several times and went on "battery" power, while still connected to the inverter. When the battery fully discharged, the power brick still wouldn't provide external power- even when plugged into the wall. That evening, I again tried plugging the power brick into the wall and was rewarded with external power and a recharge of the battery. The following day, I again plugged the power brick into the car's inverter and got flashing lights, reboots and the screen flickering between high and low intensity. Logic would dictate that the inverter was at fault. However, there are several unanswered questions. 1) Why would the external power not be available the first time I tried powering the brick from a wall socket. It had almost 2-1/2 hours to "cool down" if such a thing would be necessary. 2) I have had problems intermittently with the "refresh" cycle. When I tell the machine to cycle the battery, it discharges, but fails to recharge until I depress the red button in the back of the machine. 3) I wiggled the plug at the laptop and all seems to be tight. Tom Thomas A. Gauldin Here's to the land of the longleaf pine, Raleigh, NC The summerland where the sun doth shine, BSRB45A on Prodigy Where the weak grow strong and the strong grow great, FAX (919) 676-1404 Here's to Downhome, the Old North State.