Loading screen problem

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- I start my mac book pro (MacBookPro6,1 with Lion)
- I connected an external monitor by Mini-DisplayPort to VGA Adapter
- Immediately the resolution was changed from 1920x1200 to 800x600 (very strange)
- I unplugged the monitor but remained low resolution
- I restart the OS but nothing ..remained low resolution
- I change manually the monitor resolution to 1920x1200
- Problem: now when I start the OS the loading screen (with apple logo in the center) are always in low resolution (see attachment). How can resolve this problem?

imgres.jpeg
 

bobtomay

,
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Texas, where else?
Your Mac's Specs
15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '14 1.8 i7 8GB 10.11; 21" iMac '13 2.9 i5 8GB 10.11; 6S
After you remove the adapter - Try a SMC reset.
 

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