Boot lag (before the Apple logo pops up, and already tried primary boot disc selection)
Hello. I have a macbook pro retina 13" 2015.
The problem I have is the same as the title, but it's not the regular "choose proper boot disk from settings" because I tried that several times already.
MInd you, none of these problems remain once Mac OS booting has finished, it's just the delay before the booting starts.
Here is the list of problems.
1. There is a very long delay of black screen(backlight on) between the boot sound and the apple logo showing up on screen.
2. Post-boot key combinations take a long time to register. For instance, 'boot disk selection window' takes more than 2 minutes of waiting. I have to wait while pressing the option key. The same is true of entering recovery, resetting pram, entering diagnostics,entering safe mode, etc.
3. After I eventually get a function running, there is a trackpad/keyboard delay. Interactions show up unusably slow on Boot Disk Selector and Internet Recovery(wifi selection). Trackpad responds about a minute after I touched it, same is of the keyboard.
4. There is no wifi signal caught on Internet Recovery for three minutes or so(My hotspot is 5cm behind my mac).
To sum up, it feels like the cpu is running at 5Mhz or something.
Here's a list of what I tried.
1. resetting smc, pram
2. Reinstalling Mac OS
3. formatting internal SSD and installing Mac OS
4. Removing boot camp
5. Removing magsafe
6. Safe mode(doesn't matter eventually, because I don't think it's related to Mac OS anyway)
I Don't have any external devices nor drives, All that's present is the magsafe.
I Still have Apple Care left, so don't hesitate to tell me if you guys think it's a hardware problem 🙂. Thank you for reading, and I appreciate your help.
MacBook Pro with Retina display, OS X El Capitan (10.11.3)