Late 2012 resolution problem??

[Mvkoe]

Hey

I started my mac mini this morning, and my resolution has changed to 800x600:

I had this in the past, last month once. But then with a restart it was fixed. Now i'm restarting, trying to reset the NVRAM etc but nothing, works, tried to unplug the 19" monitor but still the same..

What's the problem?

 

[Macman45]

I'd re-set both the PRAM and the SMC:

http://support.apple.com/kb/HT3964?viewlocale=en_US&locale=en_US

http://support.apple.com/kb/HT1379


If these fail to correct the fault, then maybe the GPU?

 

[Mvkoe]

Till now it works again. Also removed google Chrome.. Made my mac mini very slow seems to me ..

 

[Mvkoe]

Oke, so today same problem. Done all the resetting and stuff.. Also, can i reset my gpu ?