system stops randomly

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http://crunchbang.org – I have installed Crunchbang in all my desktops, it's perfect.Today, I install it in my HP laptop, but the system stops for several times.(in half an hour)It works perfect in my iMac, I don't know why it cannot work in my laptop.Could anyone help?Thanks a lot.HP Laptop:HP Pavilion dv7t-7000 Quad Edition Entertainment Notebook PC • Windows 7 Home Premium 64-bit• 3rd generation Intel(R) Core(TM) i7-3610QM Processor (2.3 GHz, 6MB L3 Cache)• NVIDIA(R) GeForce(R) GT 630M Graphics with 1GB GDDR3 memory [HDMI, VGA]• FREE UPGRADE to 8GB DDR3 System Memory (2 Dimm)• FREE Upgrade to 1 (HowTos)