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Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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iMac mid 2011 black screen on start up with fan running

I rarely have problems with my computer and last year there was once a problem where my disk drive broke. After getting it replaced my Mac worked perfectly fine as good as new. I used it before the day with no problem. I started cleaning and unplugged all the cables (I turned the iMac off before doing that). After plugging all the cables back in I turned it on. The sound came but no image and the fan started to spin fast and loudly. The mouse and keyboard where responsible and I even get the sounds by clicking escape. I turned it back off and unplugged the cable and put it on a different slot by the power cord. I waited and turned it back on and everything went fine. The image came and the fan spinned normally. I let it stay like that until it went to sleep mode. I heard the fan spinning fast and loud again and the image didn’t came back. It’s there any solution?

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So I plugged it again on a different slot on the power cord and the computer works again. No problem, and I tested everything if theres something wrong. Internet works, SSD Fan is set manually on 2000 Hard Disk and 2500 on Optical Drive. I still don’t know what the issue is or what I can do to prevent this from happening again cause the iMac that I have works perfectly good with no big problems. I tested the power cord with other devices and they seem to work and the devices that are plugged in on the slots where the iMac used to be are running fine. This problem never happened before. Is it the Mac’s power cable? Does it need to be exchanged? So far it runs as it used to be while I’m typing this. I don’t think it’s a loose contact with the cable. I tested it with no issues coming up. If anyone knows what the problem is (or was) please let me know.

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Tobias Weinert will be eternally grateful.
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