I'm having a very strange problem.
The story... I was going to shut off the laptop, and before that I tried to unmount the external USB hard drive, as usual. A dialog box appeared with an error, but with no text, just an icon of error. Didn't give it much importance, and turned the laptop off in the normal way.
When I started it again, it got stuck when booting, at this part:
(starting some stuff ) [OK]
Starting Hardware abstraction layer hald .....
After a while it continued, but when I logged in, the USB devices wouldn't mount, and there was no network devices. So, I guess it has something to do with HAL.
At the grub, if th recovery mode is selected, it makes a normal boot, but after the logging in a graphic mode, it's the same thing with the hardware: there's no USB and no network.
Searching on Google I read that (in the cases I found) the problem was related with visudo, or with sudo permissions; in other it happened after building the kernel or doing an update. I have done none of these things. The only sudo thing I did before this problem was to install wine and dosbox (I removed those, just in case, but I'm sure it's not related). Therefor, I just can't understand what caused the problem, and less how to solve it.
....it all was going just so fine..... it's a shame.