I have a Dell Lattitude 620 with 2 GB RAM, Windows XP SP2. I find that it hangs / freezes during use all of a sudden. mouse, keyboard nothing works. I have no choice to boot it again.

I have tried to look at the Event Log Applications, System, etc. Do not find any entry that would help me identify the problem.

Would like to know how best I can go about identifying the problem. Is it some software? Is it hardware issue?

I had done a diagnostic boot some time back and found DST error and replaced the hard-disc. Defragged it too. This too has not solved the problem.

Will appreciate ideas from you.