startup issues

While I guess I’m not completely computer illiterate, as I get older it feels like I’m not far from it. Always before, when I’ve had problems I’ve been able to come here and, after some searching, find the answer to my problem. This time, maybe because I got frustrated, I didn’t think to come...

Hi all, My Mac Pro 4,1 (flashed to 5,1) enters a reboot loop when I start up the Mac. It keeps looping indefinitely until I manually turn it off by holding down the power button. When I turn it on again, or for the first time, it sometimes makes it past the boot screen and shuts down at the...

Well, for no apparent reason, when I start my iMac and fill in as always my password in the login screen, a new login screen appears. Only this time my user account and password are not accepted. Same happens in Safe Mode, while Apple Diagnostics finds no hardware issue. Please help. Any ideas?

Hello everyone, I have had this issue since I installed the first public betas of Mojave on my 2012 cMBP 15". If I restart my computer, the start up with stall on the Apple logo and not progress. The only way I can get it into the OS is to restart in recover mode, by holding Command + R, then...

I’ll try to explain my situation as the detailed as possible. I have a 2009 4,1 Mac Pro I bought from someone about a month ago. Since purchasing it, I’ve flashed the firmware to 5,1 and began doing hardware upgrades. So far I’ve installed the X5690 Xeon (it’s a single CPU tray version), added...

Hello, I am using a mac pro 2008 with a Mercury Accelsior E2 PCI express with an internal Solid State Drive on the card and 2 external SSD drives. I am using Mac Os X El Capitan and it's installed on the SSD that is physically on the card. and this is the startup disk. When the external drives...

I have a MacBook Pro, model 10,1. running High Sierra 10.13.4. Since Sierra this computer has often, but not every time, been failing to start - showing me the empty battery. When I then plug it in, a few seconds go by and it starts up and displaying anywhere from 25% to 65% battery. Why is...

This morning my MBA frozen at the startup screen. I couldn't restart in safe mode. NVRAM reset doesn't fix the issue In recovery mode i didn't find any issue on the disk Tried re-install the sierra and again the system frozen at the startup screen. Planning to create bootable USB and install...