HELP MBP not powering up after installing windows on external drive


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I was following this guide to install windows on external drive. i was able to boot into windows the first time. i was at step 17:06 installing bootcamp drivers but the setup got stuck at "usb virtual host controller". waited for about 20mins. then killed the process from task manager. then clicked on restart windows and while it was restarting (windows restarting screen) i accidentally pressed the power button and mac got shutdown immediately. now nothing happens when i press the power button, no backlit, no fan, nothing :( it doesn't even power up.
I tried
1. pressing power button for 30s
2. https://support.apple.com/en-gb/HT201295
3. https://support.apple.com/en-in/HT204063

Any idea what could the possible reason be?
 
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Cory Cooper

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Hello and welcome.

-Which exact model Mac?
-Which version of OS X/macOS?
-Which version of Windows?

I would try performing the SMC/NVRAM resets again by disconnecting everything. Definitely disconnect any external devices like drives, printers, etc.

C
 
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Hello and welcome.

-Which exact model Mac?
-Which version of OS X/macOS?
-Which version of Windows?

I would try performing the SMC/NVRAM resets again by disconnecting everything. Definitely disconnect any external devices like drives, printers, etc.

C
1. Macbook pro 2018 with retina diplay and touchbar
2. OS catalina
3. Windows 10 latest iso

tried SMC/NVRAM
https://support.apple.com/en-gb/HT201295
https://support.apple.com/en-in/HT204063

Can't understand that isn't the function of power button at firmware level? How can running windows and that too on external drive affect its function or worse corrupt the logic board?
Battery is fully charged. and when i connect my android to mac it shows notification that external device is charging(ie reverse charging). What could that mean about the state of the board.
 

Cory Cooper

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OK, thanks.

It shouldn't have affected it, although it could have been a coincidental failure.

Try pressing the Caps Lock key and see if it illuminates the green indicator. If so, hold the power button until it shuts off.

If you are able to perform the NVRAM reset and hear the chime, then it has power, and could be a LCD/display failure. Do you have an external display that you could attach and try?

C
 
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OK, thanks.

It shouldn't have affected it, although it could have been a coincidental failure.

Try pressing the Caps Lock key and see if it illuminates the green indicator. If so, hold the power button until it shuts off.

If you are able to perform the NVRAM reset and hear the chime, then it has power, and could be a LCD/display failure. Do you have an external display that you could attach and try?

C
Yeah tried pressing caps lock, it doesn't light up. also not able to perform nvram reset. laptop is out of warranty. i am thinking i should ask the repair guy to first unplug battery and then check because maybe it has went in some error state
 

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