White screen on iMac 2011 27"

A white screen usually indicated a problem relating to the hard drive. Try starting up holding down the option key and see if you can get to the repair partition. If so, run Disk Utilities.

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I tried that. But it's not working. I worked with this for a long time, and an hour ago i decided to take out the HDD. Unfortinately one of the pins on the display ribbon broke, so i ordered a new one now. I will update later on the week, when i tried a new harddrive.

crwdns2934271:0N'w 14, 2016crwdnd2934271:0 jonasbak crwdne2934271:0

How did it go?

crwdns2934271:0Sun 28, 2017crwdnd2934271:0 Peter Annerback crwdne2934271:0

Sorry my late answer on this topic. As meyer said it was hard drive related. I took out the hard drive and formatted it from another computer. Then I put the hard drive back in and after that I could start my iMac again and install macOS from start

crwdns2934271:0Sun 29, 2017crwdnd2934271:0 jonasbak crwdne2934271:0

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I tried that. But it's not working. I worked with this for a long time, and an hour ago i decided to take out the HDD. Unfortinately one of the pins on the display ribbon broke, so i ordered a new one now. I will update later on the week, when i tried a new harddrive. — jonasbak
Sorry my late answer on this topic. As meyer said it was hard drive related. I took out the hard drive and formatted it from another computer. Then I put the hard drive back in and after that I could start my iMac again and install macOS from start — jonasbak