What causes a "black curtain" to drop down the screen, and you are told to shut down and restart?

I have an '06 IMac. It has: Mac OS X 10.6.8 installed now
Model Name: iMac
  Model Identifier: iMac6,1
  Processor Name: Intel Core 2 Duo
  Processor Speed: 2.16 GHz
  Number Of Processors: 1
  Total Number Of Cores: 2
  L2 Cache: 4 MB
  Memory: 3 GB
  Bus Speed: 667 MHz
  Boot ROM Version: IM61.0093.B07
  SMC Version (system): 1.10f3
  Serial Number (system): QP******VGP
  Hardware UUID: 00000000-0000-1000-8000-0017F2D9A5BC
< Personal Information Edited By Host >

•Technical Note TN2063: Understanding and Debugging Kernel Panics
https://developer.apple.com/library/mac/technotes/tn2063/_index.html
•Resolving Kernel Panics - General info:
http://www.thexlab.com/faqs/kernelpanics.html
•OS X: When your computer spontaneously restarts or displays
"Your computer restarted because of a problem." - Apple Support
As previously noted, this link shows examples & info on Kernel Panic:
•OS X: About kernel panics - Apple Support
There can be hardware, and software causes of a kernel panic;
incompatible software, faulty hardware, and other details...
See first link above for an in-depth cross-section of this issue.
Good luck & happy computing!

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