I have a friends Advent 5490 which starts up with the usual bios settings error low cmos battery and after I set the time and date its starts and runs OK. So I decided to replace the bios battery after which it will not start, the fan starts and then stops and the lights briefly flash on then off and that's it. The strange part is that I happened to put the flat battery back in to try it again and it powers up straight away apart from the obvious clock error etc. Has anyone come across this problem before or got any suggestions as to a possible solution.
they are 3 volt cr2025 but they are cheap ones, the voltmeter shows them as 3.2- 3.25 which is about normal I think for new ones. But it appears that once in they are draining so it is starting to look like a problem with the bios chip. The flat battery that allows it to start up only shows about 0.15 volts so I suppose that is about like running it without a battery