![]() (Had osx Yosemite on it when i got it and Windows 7). So i started it in Internet recovery and this fully wiped the disk (disk utility) and then installed the original OSX Lion. I have removed the Bootcamp and tried to start the iMac in recovery mode to wipe the device and it refused to start in recovery mode. Second hand iMac from Uncle, all good condition hardly used. IMac Mid 2011 - EFI Rom firmware automatic update - horn or beep sound - black screen? Hi All The nearest Apple shop is a couple of hours away. Is there another way I can reinstall the OS, or should I just find a repair shop and take it in. The activity monitor is not working today but yesterday it showed activity levels towards the bottom of the graph. ![]() ![]() I can't see which version of OS I am using( I assume it is the latest as I always keep it upto date) as my mouse cursor has disappeared (batteries are new and the green light is showing on the mouse). I then tried to reload the OS (using and ethernet connection) but was given the message that I could not reload because the version of OS that I was using was newer than the version that I was trying to reload. After searching online I discovered to restart holding down the Command and R buttons then using the disc utility to repair the disc which went well and I also used verify for the OS. When I tried to restart it, the computer started with a do not disturb symbol. I tried to use AVG antivirus to do a deep scan but after scanning overnight, only 8% of the computer had been scanned (3TB HD with 1TB free). It suddenly became slow and is slow for all users. Reload latest high sierra I have been having problems with a very slow iMac (2013).
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