I have model 29297. The contrast will only go to 3, and it also starts screwing up on the background so you can't define numbers. It seems to be OK in morning and then starts acting up in afternoon. Yes, I have had it for years and used it with no problems, and all of sudden this. As you can tell, I am not very computer educated, but I knew how to set up my phone and clock. Thanks for any help you can offer. Cathy