If the problem were always at boot, I would think that it is the known issue with kernel modesetting
causing the problem. It's not too difficult to check that anyhow.
In another thread I posted this
It sounds like you may have stumbled into the Kernel Modesetting (KMS) issue. It can manifest in several ways. Check this post
. First try the nomodeset boot parameter outlined in the post and its links before trying the commands for specific hardware.
The nomodeset issue is valid for Ubuntu, Mint9, Fedora, and Debian Squeeze. You didn't say which version and edition of Mint you installed, but this could apply.
If that does not work, in searching for your graphics chipset, I found where I had posted THIS
There was a regression in the intel drivers used in the kernels for Mint 7 and 8. Many of the issues were worked out for Mint 8, but not all. Here are links to three posts which may offer some insight.
Link 1: viewtopic.php?f=46&t=36622&p=220783&hilit=82845#p210673
Link 2: viewtopic.php?f=90&t=44859&p=258538&hilit=intel+regression#p258538
Link 3: viewtopic.php?f=46&t=38828&p=222542&hilit=intel+regression#p222514
thread relates specifically to your graphics chip and nomodeset issues. Read the linked post and the one below it.THIS
Ubuntu forums post relates graphics issues with your chipset occurring other than at boot being related to the KMS problem. I have not read the whole thread.