2008 iMac display failure, dvi out to another display?

Computer seems to be running fine, but display was intermittent and now blank.  Can I bypass
Imac screen by using dvi out to another display device?
thx

Dave,
    Thanks, too late now but I wonder why the Apple Genius didn't mention TDM when I asked about backing up my data? He said data would be safe unless Apple Store roof caved in.
    All indications are that the video card is bad and Apple Care expired 9 mos. ago.
Good news is that replacement card w/labor is only $170.
     Just hope that is the only work needed.
   Genius thought my son's constantly playing Minecraft may have stressed the video card's limits  .
Thanks again.

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