Laptop keeps freezing

Hi, my laptop has been keeping freezing 3 days ago, and also it won't even start( I pressed the power button then the screen just black, of course the system won't even get to load) I've never had such problem before.

this is my laptop info:
Manufacturer:Dell
Model: XPS L501X
System: Win7 home premium, 64-bit
Processor: Intel Core i5 CPU M480@2.67GHz
Usage: 3 years

Is this a hard driver promblem? How can I fix this? Please help me. Thanks!

Papper
 
Remove the battery and use the AC adapter. See if the laptop boots. If it doesn't boot, remove the AC adapter and hold down the power button for 30 seconds. Attach the AC adapter and try starting the laptop...
 
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