Display goes bad, seemingly randomly, during install of FC3

[Arthur Pemberton]

Hello,
I'm currently talking my friend through and FC3 install over the phone. 
Her video card and monitor seem to get properly detected. However, 
seemingly randomly, the display goes bad as what she describes as a 
"barcode with color" like display. THe first time this happened on 
Anaconda launch. The second time happened while she was choosign the 
timezone on the map. The third happened while she was customizing the 
packages. As I type she's rebooting and start fresh from memory of my 
instructions.

Any ideas on what ould be causign this? I've never encountered such before.

Thanks