[ubuntu] locked up, rebooted, now no internet

Hello all,
please help:

last night I was browsing away not doing anything out of the ordinary and suddenly the computer locked up.
It has done it before, but generally when I had a lot of tabs open plus maybe a few other things, spreadsheets, VLC etc. I was thinking it's a memory issue.

But last night when it locked that wasn't the case. I only had a few chrome tabs up and I was watching youtube.

When it rebooted it gave me a choice of safe mode, memtest or normal boot.
Tried normal boot and it got to a totally black screen and didn't do any more.
Tried safe mode, and one monitor came up but I had no mouse.
I shut it down and went to bed.

This morning to my surprise it booted up and seemed fine!
Except that I had no internet.

Specifically, Chrome says:

There is no internet connection
your computer is offline
dns_probe_finished_no_internet

When I went to system settings - network I got:

The system network services are not compatible with this version.

I have no idea what to do at this stage.
Can anyone please help?

system details:
Ubuntu 12.04 LTS
Kernel Linux 3.13.0-93-generic
GNOME 3.4.2

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[ubuntu] locked up, rebooted, now no internet