It started as a battery problem. It reported 100% full status, but wouldn't turn laptop on. I went back to T-Com center and tried with another battery, but it didn't work either. Now it's back for repair.
I was wondering where huge savings for netbook class hardware comes from. Partly it's smaller display, older chipset, but partly it's integration testing. Nobody ever tried to discharge this battery within laptop and than charge it again in this laptop (except me). When you buy server, you know that it has passed burn-in period of at least 48 hours. When I install it, I always leave it on for 24 h before I begin to work on it. As it seems, this is also good idea for laptops.