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I recently upgraded to Big Sur on Saturday. I left the office and came back and on Monday. I take the computer out of sleep and the login screen has dancing bars going vertical. I restarted and the Apple logo shows up like this. The computer will start up and it runs find but the screen ends up with all these blurry square lines running vertical. Any idea why this is happening?
You can save you and us a lot of time and effort if you do the following:
Please navigate to the Mac App Store or navigate to www.Etrecheck.com and download the free version of EtreCheck. Once you have you downloaded the app and installed it, please run the report and save it. This report will help us get a good idea what has been installed on your system and help us be able to diagnose what may be wrong.
When you have your report, you can attach it when you reply to this message and we can then review it and help you determine what is needed to get your system running well again.
For instructions on how to download your EtreCheck report and attach it to your reply to this message please click https://discussions.apple.com/docs/DOC-250000211
Thank you for the information. I am trying type on this computer to send the report to you, My apologies if spelling is off. I think if you click report you should see all the info. I ran the report and then clicked shared and copied the text.
The best antivirus, cleaning app, and overall maintenance app for Mac OS is Mac OS itself. All you need to do with Mac OS to keep it secure and running well is to keep it up-to-date and do periodic (about 1x per week) restarts. Other than that, leave it alone. Adding third party antivirus, cleaning, security and other types of maintenance apps to Mac OS adds no additional level of security. The only thing these apps do is have the opposite affect users want. They make Mac OS slow, unstable, generate odd behavior (much like you are experiencing) and make Mac OS appear buggy.
Please locate the developers uninstall instructions for MacBooster and follow to the letter. Then restart in Safe Mode per the directions in Use safe mode to isolate issues with your Mac and then restart normally.
I wholeheartedly agree with rkaufmann87 on the MacBooster. It does nothing for the system that a reboot won't do and running in the background is only a resource hog. Uninstall it accordingly to the developer's instructions.
Just some food for thought: unless you're using a true VPN tunnel, such as between you and your employer's or bank's servers, they are useless. Public VPN's are anything but private.
something I could repair? I saw a video where this guy had something similar and he brought it to apple. They have a backdoor to test the hardware, a series of diag test but he wasn't allowed to film it.
You can try but if it's the GPU that means the whole main logic board goes as the GPU is nothing more than a chip soldered to the board. If it's the display itself you could try to do it but iMacs are very difficult to work on and you stand a better than average chance of doing more harm than good. Take it to your local AASP to be diagnosed first then you can decide what to do.
So I just remote logged into the computer and I see the screen fine. So it seems to me it has to be the display or the GPU? Does that make sense? The screen looks perfect when I remote login.
Yes, either way it would be very expensive to repair. Any chance the computer is covered by AppleCare?
Thank you for all your help. I have decided to just buy a new one. Any recommendations on what to do with the old iMac?
Apple will recycle it for you at no charge or if you are in the US, take it to any Best Buy and they will recycle it too.
iMac Screen Issues
