the car battery is running down? Does it beep and shut down with the engine running?
I use my Acer Aspire 5720 15.4' for a business that I run out of my car.. I decided to purcahse an inverter so that I can use the notebook longer. I've purchased 4 inverters and none seem to work properly... I went from 90w- 400w looking for a solution.. The inverters seem to be working fine but after 45 minutes they've all made a beeping sound then shutdown... They also beep then shut down when the car is set to only run the radio and the engine is off... I would truly appreciate any help... It seems like ive tried everything to no avail.. PLEASE HELP!!!!