Roostaw wrote:
I have an IMac tell based desktop which has started to take ages to do anything, almost as bad as windows. Now the computer comes up with a grey screen and then shuts down on its own.
Assistance appreciat
Before you do anything backup the whole system using Time Machine and if you can create a second backup using a bootable clone. You may have a hardware problem and you need to preserve your data!!!!
Your HD sounds like it's beginning to fail. I would strongly recommend running Apple Hardware Test in Extended Mode. You should run it 2-3 times to ensure AHT picks up any errors, running 1x doesn't always pick up errors. If you have any errors then it's time to take it in for service at your local Apple Store or AASP. If you have AppleCare coverage then call them immediately and tell them what you have done and they will advise what your next step is.