Dear friends,

Below is the link to my YouTube video.
I have an A1989, 820-00850, which has 20 volts, its amperage, and which boots up without displaying anything on the screen unless I press the "Option" key.
External drives can be seen if they are connected, but I can't access them.
I can't do anything except that.
I don't have your knowledge to resolve this problem, if a solution exists.
Can you help me please?

Sincerely, Pascal


https://youtu.be/LtVKceAksyM...

Dear Team

I'm replacing a hard drive on a Mac Mini A1347 (2014) (820-5509). I reinstalled it and got three beeps at startup.
I tried a PRAM reset, but it didn't go through the three beeps.
I removed the battery, no change.
I examined the logic board under a microscope, but I didn't see anything.
Can someone please tell me what to do or what to look for?
Thanks everyone.