A school has several identical laptops bought 5 years ago: Fujistu Lifebook model A530
Since several weeks, around 50% of them randomly tus off after 1 to 5 minutes:
- the shutdown is brutal: one second you work on the laptop, the next second it is completly stopped
- inverting batteries between a working laptop and a broken laptop also invert the problem: so the problem "follow" the batteries
- only when on battery. Pluging the power cord suspend the problem. Once unplugged, the laptop will stop after 1 to 5 minutes again
- idle CPU, low memory usage. Even when no one touch the laptop
- the battery charge state doesn't change anything
- after a suddent shutdown, we can reboot the laptop without problem because the battery is still charged as before. So it will stop 1 to 5 minutes later
- appens only while into BIOS or runing Windows 7 pro 64-bit, not while running a Linux boot from a USB key
- the laptops worked several years without problem, and nothing as been done recently (and more: they are theorically identical from a software point of view, so why only 50% of them?)
- I don't see any strange program or anything