A little while ago I thought I had brought my old PC back to life. I proudly announced the cure on my BLOG. http://www.painters-online.co.uk/Blogs/life-can-be-wonderful/How-to-Bring-Your-PC-Back-to-Life/_bl623_po3043_pg1 It now appears the jubilations were premature. The machine shuts itself down again after a couple of hours. I suspect it gets overheated. I will have to have a look inside to see if the fan is still working or dust has covered the heat sink. I will let you know as soon as I know more.