My MacBook Pro display won't work without a second display plugged in. What caused this, and how do I fix it?

I'm using a Dynex Mini DisplayPort to DVI Adaptor to use a second display (an older display, I'll admit). After I have unplugged the adaptor, my MacBook still tries to read the second display, and switches back-and-forth between a blue screen & my desktop. It stabilizes once I plug the adaptor back in. What is causing this problem, and how do I fix it so I can use my primary display without having the adaptor constantly plugged in?

Reset PRAM.
http://docs.info.apple.com/article.html?path=Mac/10.7/en/mh26871.html
If not try Reset SMC.
http://support.apple.com/kb/HT3964
Best.

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Please take a look at these screenshots and help me!
http://imgur.com/a/P19lF
these are the specs of my computer
Model Name:          Mac Pro
Processor Name:          Quad-Core Intel Xeon
Processor Speed:          2.26 GHz
Number Of Processors:          2
Total Number Of Cores:          8
L2 Cache (per core):          256 KB
L3 Cache (per processor):          8 MB
Memory:          16 GB
Processor Interconnect Speed:          5.86 GT/s
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SMC Version (system):          1.39f5
SMC Version (processor tray):          1.39f5
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Type:          GPU
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Slot:          Slot-1
PCIe Lane Width:          x16
VRAM (Total):          512 MB
Vendor:          NVIDIA (0x10de)
ROM Revision:          3386
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Display Connector:
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display 1
LED Cinema Display:
Resolution:          1920 x 1200
Pixel Depth:          32-Bit Color (ARGB8888)
Main Display:          Yes
Mirror:          Off
Online:          Yes
Rotation:          Supported
Connection Type:          DisplayPort
Chipset Model:          NVIDIA GeForce GT 120
Type:          GPU
Bus:          PCIe
Slot:          Slot-2
PCIe Lane Width:          x16
VRAM (Total):          512 MB
Vendor:          NVIDIA (0x10de)
ROM Revision:          3386
display 2
Display Connector:
Status:          No Display Connected
LED Cinema Display:
Resolution:          1920 x 1200
Pixel Depth:          32-Bit Color (ARGB8888)
Mirror:          Off
Online:          Yes
Rotation:          Supported
Connection Type:          DisplayPort
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Make a "Genius" appointment at an Apple Store to have the machine tested. Back up all data before you go.

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Hey HaydenJulie,
Thanks for the question, and welcome to Apple Support Communities.
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Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.
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All sorted now. Thread can be closed!

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4SNS/1/40000000 LB1T
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My MacBook Pro display won't work without a second display plugged in. What caused this, and how do I fix it?

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