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Try removing the batteries, and leaving the camera on a (dry, non-humid, non-dusty) shelf for overnight. Then put the batteries back in and try the camera again.
Then try cleaning the terminals in the battery compartment, after removing the batteries, first by rubbing off with a fresh pencil eraser, then by wiping the terminals off with cotton swabs moistened in rubbing alcohol, then letting them dry off for 5+ minutes with the battery compartment door open, then try turning the camera On again.
How long has the battery or batteries in the camera been in-use? If over a year, then you might possibly have a battery/batteries that are getting weak. Rechargeable batteries do get weaker with time, and eventually fail to deliver enough power to start up a device like a digital camera; they then need replacing. The replacement battery needs to be charged up for 6+ hours before its first use, owing to its having been on a shelf for a considerable time.
How old is the camera? in months or years since you bought it.
Has the camera been dropped or otherwise subjected to mechanical shock(s) in its lifetime?
Has the camera been operated in or subjected to, temperatures below 32 degrees F (freezing point) or above about 100 degrees F ?
Has it ever been subjected to a humidity higher than 85 % or gotten wet ?
Has the camera been operated in a gritty or sandy environment, such as a beach, a seaside, a construction site, or the like?
How old is the camera, please?
Cleaning the battery terminals *might* help, but it is not very likely, for this sort of problem.
The LCD sensor isn't the problem, if the screen is utterly blank or dark.
Then it is not covered by warranty.
Try removing the battery and leaving it Off overnight. It has a small chance of fixing the problem.
Is the screen showing that error? if so, that's a fairly good sign.
OK, the viewfinder.
Err 80 is electrical control or image malfunction.
Possibly. But leaving the battery out overnight won't take much time away, and will allow you to be sure it needs servicing tomorrow.
You can call 1-800-OK-CANON to try to arrange sending it off for service to Canon.
Or, you could let me know your locale, by zip code, or by town/city and state, and I can get listings for nearby camera shops qualified to service a good Canon DSLR.
If this answers your question, please rate my answer. A five-star rating would be appreciated!
If you need more info, or have any comments, use Reply To Expert to respond.
OK... I'm researching and will post again in some minutes...
Abilene TX has these:
Bill's Camera Shop
Camera Repair Shop
Address: 4301 S 5th St,
Abilene, TX 79605
Cardinal Camera Services
Abilene, TX 79602
There does not seem to be anything nearer.
If these two cannot help, let me know, and I will find other listings.