Yesterday, our wireless router died. We didn't get chance to take a look at it because we ended up going out to Wing Wah for an all-you-can-eat buffet, which was kind a spur of the moment decision.
Tonight on my way home from work I popped into the Birmingham branch of Maplins to buy a multimeter. I tested the power supply and it turned out to be dead. We went to the Coventry branch of Maplins to buy a suitable replacement. We ended up spending £20 instead of £45 it would have cost to buy a new router.
We suspect that the old power supply overheated (and the router itself would get very hot) so we now use a timer plug as well, so the router is turned off for a couple of hours each night.