I received a ThinkPad (T23) in the post a few days ago. It had been left in Sleep mode and the battery was too flat to boot.
I had intermittent power-on probs for a day or so. Now if I press the power button nothing happens, but removing the backup battery at this point will turn the machine on (no need to press the power button again). Leaving the backup battery out entirely solves the problem, and the machine turns on first time with no problem -- although it will not load the operating system, so doing away with the backup battery entirely doesn't seem to be an option :(
I think the Power Manager has got stuck into thinking there's no power as a consequence of the extended sojourn in sleep mode with a near flat battery.
I flashed the BIOS with the latest version to no avail (it is possible to power on with the backup battery installed but it takes a lot of messing around, diconnecting/reconnecting AC & batt etc). I have also tried draining the capacitor by keeping the power button pressed with mains/batt and backup disconnected.
I have a couple of questions. Is it possible to disable the pre 'power' on test? Why hasn't leaving the motherboard without any power for a few hours already reset the system -- could this prob be due to something else entirely?
thanks for everyone's time.