Your Samsung Recovery screen shows "fail to open recovery_cause (No such file or directory)" near the bottom, followed by lines such as "Reboot Recovery Cause is [UNKNOWN]" . If the Recovery menu is visible, Recovery Mode has already opened. This line does not by itself mean that the recovery partition, motherboard, or personal data has failed. The message says that Samsung's recovery environment could not read an expected record describing why the device entered Recovery. The decision changes with what happens next: a Galaxy that reboots into Android and works normally is different from one that keeps returning to Recovery or also shows mount and verification failures. Do not factory-reset a working phone merely to remove this diagnostic line. First read the other lines on the screen, choose Reboot system now if no destructive action is intended, and judge the phone by whether it boots, unlocks, reads files, and stays stable. Photo by Mark Chan o...
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Samsung Power Button Not Working? Force Restart and Repair Criteria
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Your Samsung power button does not respond, but the phone may not be dead. First separate a stuck button from a frozen screen, low battery, case pressure, or real hardware failure.
Check Whether the Button or the Phone Is the Problem
If the power button does not work, check whether the phone still reacts to charging, calls, alarms, vibration, or touch. A button failure and a dead phone can look similar, but the next action is different.
Remove the case first. A tight or damaged case can block the Side key and make it feel like the button failed. Then connect a known-good charger and watch for charging signs.
Photo by John M. Smit on Unsplash
Protect Access Before the Button Fully Fails
A weak Samsung power button becomes more serious when the phone turns off. While the screen still works, the first goal is not repair shopping. The first goal is keeping access long enough to back up data and avoid a lockout.
This is especially important if the button feels inconsistent rather than completely dead. A half-working Side key can fail at the worst time: after the battery drains, after an update restart, or after the phone powers off overnight.
Keep the battery above a safe level, enable any available on-screen power menu access, and back up important files before testing the button repeatedly. If pressing harder is the only way it responds, stop using force and plan repair.
Use Restart Alternatives While the Screen Still Works
If the screen still works, use software controls before the button problem becomes a no-power problem. Quick panel power menu, accessibility options, or scheduled restart settings may help you keep control temporarily.
Do not wait until the battery dies. If the phone powers off and the button is truly broken, turning it back on may become harder.
AndroidFixLab at www.androidfixlab.com treats a weak power button as a timing issue: back up data while the phone still wakes, then decide whether repair is necessary.
Fast priority: keep the phone charged, back up data, remove the case, and avoid repeated hard pressing if the button feels stuck.
When Force Restart Is Still Possible
A force restart may still work if the Side key partially responds with Volume Down. If nothing happens, do not assume the restart method is wrong; the button itself may not be sending input.
Try the button combination once with steady pressure. If it works, check whether the Side key feels sticky, delayed, or inconsistent afterward.
Repair becomes more likely when the button feels loose, stuck, sunken, or inconsistent after the case is removed. Liquid exposure, drop damage, or repeated pressure can also make the Side key unreliable.
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