prohibitory sign

I'm trying to upgrade my late-2012 mini stock HDD with Samsung 870 EVO SATA 2.5" SSD. At first I was having issue with getting disk utility to detect the drive, i thought it was a loose connector so i redid my setup and it popped up. Then during the OS installation using bootable Catalina USB...

Hey guys I'm new to this Forum and I was wondering if you guys could help me out with some issues I'm having with 3 Macbook pros that i recently got from my friend that runs a computer recycling business. The Macbooks have an operating system on them that works fine but it is password locked...

Hello all, I recently bought a 500 GB Samsung 860 EVO 2.5” form factor SSD to swap it out with the primary HDD in a mid 2011 21.5” iMac. Problem is, the computer doesn’t boot (shows a prohibitory sign) whenever the 860 is inside the chassis and connected to the motherboard through SATA, however...

Lately I wanted to format my MacBook Air 2016 edition and for that I thought I should eject and erase Macintosh HD too and well somehow I did it and now I cannot install OS High Sierra on my MacBook Air because I have no storage slot for it. The “Macintosh HD” is gone and I’m left with OSX Base...

Hi, I'm having a problem doing a clean install of macOS High Sierra on a MacBook Pro 13 early 2011 I installed a brand new SSD and tried to install High Sierra but I'm having issues I've tried doing Internet recovery and USB bootable but both won't work, the SSD works perfectly cause I tried on...

Hi everyone, new to the forum here. I don’t consider myself a computer wiz, though I know more than the average consumer. I’ve been having bizarre issues come up since installing High Sierra, so I tried to do a factory reset of my 2017 MacBook Pro. I erased my drive and restarted the...

Hi guys, I've been running a late 2009 27" iMac with a Samsung 840 SSD (replacing the SuperDrive) on Sierra. I've had persistent problems for a while booting up to the 'prohibitory' symbol. Usually a second or third restart eventually boots successfully. Running Disk Utility reports no errors...

Hey MacBook gurus.. Ready for a puzzle? So, here's the story. My buddy spilled coffee on his computer, it "turned off immediately," but I had him do a hard shut down anyways to be safe. We drained everything out, and dried everything off. Apparently he tried to turn it on again (against my...

Hello. Yesterday I decided to update to Sierra from El Capitan on both the disks on my Macbook Pro (mid 2012); the update on my SSD went without a hitch so I decided I'd update my other disk, too. I downloaded the .app and the installation started as normal; once it got to the point where I'd...

Hello. As a disclaimer, I know very little about this subject matter so if you have a suggested solution please explain it to me like I'm 5. About two days ago, I began setting up Boot Camp on my Late 2014 iMac Retina 5K (27") running macOS Sierra 10.12.2, with the intent to eventually transfer...

Hi everyone, So I got an imac from work after we upgraded all of the computers. Its a mid 2008 imac, it was running os x Leopard 10.5.8 prior. Apparently they used DBAN on it to wipe out private/sensitive information. I tried burning a .dmg file for leopard 10.5 installation on my pc laptop...