Probably the monitor - gfx cards fail, but far less frequently than the
screens they're attached to.
I've had one gfx card fail* since 1993 (?) but i've had about 5
* it had not been installed for about 4 years, but didn't work when I
went to use it as a backup in another machine, so might have been
damaged in the "bits crate" it was lashed in.
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