Key combination does not respond before the start

Hello. I have a macbook pro 13 "2015 retina.

The problem I have is the same as the title, but it's not regular "choose the appropriate settings startup disk' because I tried already several times.

Mind you, none of these problems remain once Mac OS startup has finished, it is just the period prior to initialization.

Here is the list of problems.

1. There is a very long period of black screen (backlight on) between the startup sound and the apple logo appears on the screen.

2. start after key combinations take a long time to register. For example, 'boot disk selection window' takes more than 2 minutes of waiting. I have to wait while pressing the option key. It also applies to enter recovery, reset pram, entering the diagnosis, enter safe mode, etc..

3. once I finally get a function running, there is a delay of keyboard/trackpad. Interactions appear unusably slow on Boot Disk selector and Internet Recovery(wifi selection). Trackpad responds a minute after I hit, it is the keyboard.

4. There is no wifi signal on Internet recovery for about three minutes (my hotspot is 5 cm behind my mac).

To sum up, it feels like the processor is clocked at 5 Mhz or something.

Here is a list of what I tried.

1 reset the smc, pram

2 reinstalling Mac OS

3 internal SSD flash disk formatting and installing Mac OS

4. remove the boot camp

5. remove the magsafe

6 safe mode (no matter, because I do not think it is related to Mac OS anyway)

I have no external devices or readers, all that is present is the magsafe.

I always have Apple Care has left, so feel free to tell me if you think it's a hardware problem. Thank you for reading, and I appreciate your help.

Please make an appointment at the Apple Store - Genius Bar store and bring it into service. If you are in the United States or is unable to make an appointment in this way, contact your Apple store.

Tags: Notebooks

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