MacBook Pro 2010 13.3" After formatting the disc white screen without folder icon and no access to bootloader

[astarana2007]

Hello
Sorry for my bad english, i'm swiss


My MacBook Pro 2010 suddenly got a whitescreen after formatting the HD, access to the bootloader is not possible (ALT), no Apple logo, no folder icon, nothing.

The internal SSD was formatted by the previous owner. But to boot from the USB, I have to press the ALT key... and it doesn't respond, no matter if external keyboard or internal.

I have installed Mac OS via an external Sata adapter on my MacBook Air, but he also does not want....

No idea which MacOS was on it before, I only know that Windows 7 was on it. I think but the High Sierra on it. MacOS Sierra is supposed to be on it.

The Mac does not react to any keyboard input, so when I press T nothing happens, when I press ALT nothing reacts.

I left the Mac without doing anything, with the USB stick in it, but nothing happened, only a white screen.

The startup sound comes.
Previously never apart until this error, only an SSD was installed nothing more.
I installed MacOS Sierra via this USB stick with the SATA adapter via my Macbook Air.

What I also noticed is that the Mac also does not want to boot from the original Snow Leopard? CD will boot.

I hope someone can help me, specs are

C2D 2.4ghz
8GB Ram
250GB Samsung SSD
BJ. mid 2010

LG Astarana2007

 

[fspkwon]

you need the 10.6.4 disk and if your installing for example os switching you have to before you reboot install the combo update or its going to crash and also install the 10.6 8 EFI Firmware update

 

[paardenkapper]

Grüezi!

I think you should create an installer boot stick for MacOS High Sierra - you can download is from Apple.
If you have no other Mac device ready you could use the program TransMac to create a bootable installer.

The white screen only is really strange - if it cannot find an accessible boot device it should give a question mark folder.

Try resetting the PRAM before moving on - press ALT + OPTION + P + R directly after pressing the power button and keep it pressed until it chimes a second time.