Vram failure and display mirroring question

Sorry if this has been asked before...
I have an older imac g5 ambient light sensor and have had a vram failure for the past 6 or 7 months. Recently the display has gotten to the point where it's impossible to read or see anything on it.
My question is, will mirroring show the same distorted video on an external display?
Thanks.

Can you explain this "vram failure" in more detail?
Have you tried using these two procedures?
Reset PRAM
http://support.apple.com/kb/HT1379
and reset SMU
http://support.apple.com/kb/HT1767
Whether the external display shows the same issue or not depends on the cause. If the cause is at the graphics hardware, it will probably be the same on the external display. If the cause is LCD (or the connection between the LCD and graphics hardware), then the external display should work OK.

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