My inspiron 1525 stops working

I wrote "stops working" because it remains on, but eventually you'll hear the fatidic "click" on the left side of it and the activity light dies and you can do nothing else. The pointer might move, if there was a youtube video playing it will continue to play (I guess if it was loaded), but you can't do anything else. After the click, it's over. All you can do is force it off and turn it back on. Chkdsk has run, Avast check returns nothing, cooling paste is in place and so is the fan ad the ventilation system. It makes no difference what I'm doing at the moment, and for the record I do nothing too heavy here, no games or anything.

I'm on Vista and currently using Mozilla, but this happened with Chrome as well.

I'm not too keen on installing Dell System Detect. Any ideas?