I've got two Acer Aspire ZG5 netbooks. One with hard disk, one without.
The one without a hard disk developed a problem where it would switch off after about 10 seconds. That problem went away after I fiddled with the memory compartment.
The one with the hard disk has developed the exact same problem. I fiddled with the memory compartment and the problem has not gone away.
I am really frustrated. I am also irritated about the quality of the devices. I don't think I would ever buy one of these again. Come to think of it, I probably will never buy a netbook again. I will stick to my MacBook.