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I've had many problems of late with my iMac going to a grey screen at startup. When it does work now, and I open (for example(s) a video on youtube, scroll through my bookmarks, open google drive...there is a slow and constant refresh at a slow enough rate for me to see.
iMac (27-inch Mid 2011)
Greetings timryk,
It appears you are experiencing display and startup issues on your iMac. Based on the information you have provided, it appears your iMac may need to be serviced. The following link should help you get started with the process and has links with additional information on topics such as warranty and service pricing, battery replacement, and express replacement service.
Apple - Support - Service Answer Center
Thank you for contributing to Apple Support Communities.
Best,
Bobby_D
display keeps visibly refreshing
