I am using a samsung S4 with the lollipop OS (no root).

A couple of days ago, I saw this message when I restarted my phone



I pressed Volume Down, but I was not able to restart my phone.

After looking up tips online, I had to press Volume UP + Home + Power button to restart my phone, but now I have a sign on my screen saying it is running in 'Safe mode'. In Safe mode, I noticed that apps will not work.

I am not sure what is causing this. Would fixing the Volume Down button help?

pressing volume button while booting will enter safe mode.

thus 1 of your volume button is stuck hence booting into safe mode. go fix that volume button

setiap kali restart naik warning tu ke?

Thanks for the confirmation.

I can increase my volume but not decrease it, I suspected it's because of the volume down button.

Yes.

Oh, maknanya volume down tu rosak la tu. sebab warning prompt tu keluar bila nak masuk bootloader aka Volume Up + home button + power button

is this a quick fix or need to leave the phone at the store?

what phone? see youtube for teardown of your phone . some phone uses ribbon cable, and some uses button soldered to your main board. both takes bout 10-20 mins to replace

Mine is an older phone, galaxy S4.

hopefully the guys at lowyat have the spare readily available.

s4 button is soldered. that button easily available

I got it sorted out.

Took about 30 minutes for RM 35 in Lowyat.

thanks for your help.