My computer crashed and how to solve?

Users questions: Computer c2.9, 512m, will run their own crash, black screen, hard drive light does not shine, sometimes from their own weight, and sometimes necessary to press the reset button, cpu fan changed, the temperature is not high, please enlighten me!
Experts answer: estimated to be hardware problems. Hardware is most likely to cause crashes memory CPU, motherboard and graphics card has. 1, when the memory or unstable quality or other issues can easily lead to crashes or blank screen phenomena 2, if the CPU's secondary cache problems can lead to crash occurrence 3 motherboard in question will appear a black screen crash phenomena solution: find a Good computer, remove the memory, CPU and graphics card. 1, replace the first memory to the top of your computer, boot to see if there are crash problems, so you can detect whether the memory of why. 2, and then replace the CPU on your computer to see if there are crash phenomenon. This review CPU test is normal. Finally replace the video card to rule 3, if replaced by the above still exist after the crash phenomenon, then the problem is the motherboard Tip: If you yourself can afford to, you can own for the replacement operation, if not sure do a good job, find a knowledgeable recommendations The help you, or repair
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