[Android Central Question]

My Samsung Galaxy S7 is stuck in boot with the "no command" error screen. I found out I can possibly fix the problem by wiping the cache partition, and have found the recovery menu to do this.

However, my power button does not seem to work in the recovery menu (it does work for powering the S7 on, however. Thus, I can not select the menu item to wipe the cache partition.

How can I get rid of the no command error? If wiping the cache partition is the right way, what am I doing wrong? I don't want to factory reset my device.

I am not usnig a modified version - I use the android version shipped by Samsung

[mustang7757]

Hi, welcome to Android Forums

I'd like to recommend creating a account so me or other members can assist you, as guest have limitations in replying here and if we need further Information to communicate with you.

I'll provide a link to register, please come back to your post so we can further assist you . Thank you

https://forums.androidcentral.com/sh...d.php?t=409154

[mustang7757]

Power and volume up to enter recovery

[B. Diddy]

Welcome to Android Central! Just to be sure -- is this how you're getting to the Recovery menu? https://support.t-mobile.com/docs/DOC-28028

[mgla]

@mustang7757: Thank you for your help with the sign up. I am already in the recovery menu.
@B. Diddy: Yes, exactly that way. I can use vol up/down to select entries, but not use the power button to use an entry.
Using the Home button does also not work (holding vol up/own or home for a second does change the background color of the highlighted entry, though,
However, using Vol Down + Power in the very same menu initiates a reboot.

[B. Diddy]

Hmm. This is a longshot, but swab the Power button with some rubbing alcohol (and make sure it gets into the cracks), in case there's some residue that's causing problems.

[mgla]

Thanks for the advice. I tried it, but it did not help. Any other ideas?

[B. Diddy]

Sorry, but I'm afraid I don't have any other suggestions. I was searching to see if you can do it via ADB command, but I think the phone has to be rooted: https://forum.xda-developers.com/sho....php?t=2580269

[Rukbat]

That can be one of 2 problems.

1. A bad or stuck power switch. (The switch would have to be replaced.)

2. Bad firmware. (You'd have to reflash the firmware - see [Samsung] How to flash Stock ROM via ODIN).

Unfortunately, to check the switch, the phone has to be partially disassembled, which is NOT a DIY project, so the phone would have to go to a repair shop for diagnosis.