A school has several identical laptops bought 5 years ago: Fujistu Lifebook model A530
Since several weeks ago, around 50% of them randomly turn off after 1 to 5 minutes:
- The shutdown is sudden: one second you work on the laptop, the next second it is completely powered off
- Swapping the batteries of a working laptop and a broken laptop causes the working one to fail, and the failing one to work. So the problem follow the batteries
- Only when on battery. Plugging the power cord in fixes the problem. Once unplugged, the laptop will shut down after 1 to 5 minutes again
- Idle CPU, low memory usage. Happens even when no one is using the laptop
- The battery charge state doesn't change anything
- After a sudden shutdown, we can reboot the laptop without problem because the battery is still charged as before. But it will stop 1 to 5 minutes later
- Only happens while in BIOS or running Windows 7 pro 64-bit. Everything is fine while running Linux booted from a USB key: it runs 1 hour without problem
- The laptops worked several years without problem, and nothing as been done recently (and more: they are theoretically identical from a software point of view, so why only 50% of them?)
- I don't see any strange programs or anything
