Ubuntu. Over the past few weeks it has had difficulties charging the battery and last week it finally gave up the will to live.
I found a handy service manual online and stripped the laptop down and found that the DC power jack daughter board had failed. After some more research I found that this component has a history of failing this way, so I felt more certain to risk spending some cash and getting replacement. I managed to find a new replacement part for less than £5 (including postage and packaging) on eBay which promptly arrived a couple of days after ordering.
Is was both annoying that the board had failed perhaps because of poor design, yet also a relief that a cheap daughter board replacement could fix the issue without the need to replace the entire motherboard. Within half an hour I had replaced the daughter board and re-assembled the laptop and fortunately it worked first time. I later discovered that there is a video on YouTube explaining how to do this fix, which I wish I had found earlier!
Anyhow, the machine lives on, hopefully I can squeeze a few more years of use before it finally succumbs to old age.