Photoshop PS 5 question

Hope someone can tell me what’s happen to my PS5.I was sick and in hospital for 2 1/2 months .When I booted my computer my hard drive had crashed. Reinstalled PS 5 on new hard drives and now when I drop a photo into PS5 the picture is plaid. I can ether click one + or - and the picture is normal. If I click + or - again and I get the plaid picture again .It goes on and clears up on next click. Any ideas what going on with this installation.

My Lightroom 3 installation is ok.

Hope I put this where it’s understandable

Neil