Start the problem, when I plug my Gateway M520s Laptop to AC car adapter. When I press the power button second after power indicator LED Blinking (manual says LED Blinking-notebook is in standby mode).Unplug the AC cord and remove the battery for 2-5hrs and press the power and F2 for bios setup windows. I can see Bios option after 2-3 minutes shut down itself power indicator blinking again and with black screen. Hold the power for 3-6 sec. to shutdown and press again suddenly power indicator blinking can’t go no more to bios setup. Same thing happen as there is a windows XP boot up disk in the DVD Rom will try to read disk and shut down the few minutes and power indicator start blinking. Does anybody know what’s the problem of my laptop, where I start to troubleshoot?