Fatal problem with screen going bezerk

Hi all
I have a serious issue with my MBP-12 (not the newest version) that goes like this: At work, I use an external monitor (via displayport) with a different resolution. My MBP is ”closed” and called up soley by the connection. When I leave for home, I simply unpluck the cables (power, usb, displayport) and the MBP hypernates. When I come home, I open up the mac and it would normally just adjust screen resolution and be ready.
However: Lately, I get a serious fault here. The screen goes bezerk and shows all kinds of dots. Even if I close the screen again, it will not come back to normal. I have to pull the emergency break and power off totally and the reboot.
I am unsure if this has to do with the new Mt. Lion. I have upgraded to that.
Or if it has to do with a hardware fault – a loose connection or what ever.
So:
- is this a known issue – that the MBP (perhaps due to Mt. Lion) has problems with switching between resolutions?
- or could the be a hardware fault here?
Morten

By the way:
- software version: 10.8.1
- build 12b19
- 2.2 gbh intel core i7
- 15´´internal display with dual graphics
- 8 gb 1333 mhz ddr3

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