Originally Posted by madmage
it did it again... this time I noticed that caps lock and scroll lock were blinking... this is definitely something wrong...
CAPS and Scroll Lock blinking usually means Kernel Panic.
There are several reasons for those, please go through your logfiles and look whether you find something. Else try testing through your hardware (RAM, Harddisks etc.) and try whether this occurs with some drivers (wlan, nvidia, ...) disabled.