Laptop switches off automatically

Hi guys i have dell studio 1555 laptop with processor Intel core 2 duo t6600 and ram 3 gb with video memory ati radeon 4570(512 mb) running windows 8.1 x64.I uses my laptop to download movies so it runs almost 24 hrs a day recently when i got back from my work laptop was turned off (no power outage was occurred at that time) when i tried to turn on the laptop it starts to produce continuous beep sounds(and no display) after some trial and error i found out that charging adapter was the culprit if it is connected laptop won't turn on and continuous beeps sounds occurs , but if you start the laptop without the adapter and then connect the adapter back on then no problem. And the event viewer has under the critical error section an error named Kernel power(event id 41)(The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.) and i will list some of the errors in the event viewer here
kernel event tracing(Session "" failed to start with the following error: 0xC0000011),ACPI(: The embedded controller (EC) did not respond within the specified timeout period. This may indicate that there is an error in the EC hardware or firmware or that the BIOS is accessing the EC incorrectly. You should check with your computer manufacturer for an upgraded BIOS. In some situations, this error may cause the computer to function incorrectly.) ,Ntfs(The default transaction resource manager on volume E: encountered a non-retryable error and could not start.  The data contains the error code.)
Can you guys please help me find the problem and its solution ?