For about the last 6 months my computer seems to be quite tempramental. When i move it between uni and home and first boot it up it likes to repeatedly restart leaving a few seconds between each time it does it. This usually lasts for about 20 minutes then it runs perfectly (besides the odd crashes). However, the most recent time I brought it up to uni, about 3 weeks ago it didn't want to stop doing the restarting but only when my network cable is plugged in (I can get it running offline but as soon as I plug the cable in it crashes). I formated it with a fresh install of windows and the problem is still there indicating it must be a hardware problem. Yet I have no idea where to start to look at what component/s need replacing. It could even be a loose fitting I guess. Can anyone offer any help? Cheers.