Before I head off for town to see if the smartphone repair guy has opened up, I’d welcome some thoughts please.
My Samsung phone went into safe mode 3 days ago and I could not turn it off. So I left it on one side. Two days ago the screen started flashing violently and continuously. And I mean flashing, not flickering. I look for advice via google and I’m told to turn this off, that off on my menus. I cannot get into my phone, or do anything with it because the screen is flashing at me non-stop. And I cannot turn it off.
Any chance of repair?
Try holding the volume down button and power button in simultaneously for 20 seconds or it vibrates or powers down, it might take a few tries.
Which Samsung model is it.
Take the battery out?
The volume down button IS the power button. It’s an A21s
I think I’ll let him do that. I’m nervous of making it worse.
Hello Griffin - thank you soooo much. Shows you how much I know about my phone! I never use the volume button. Done what you suggested and it’s worked. 
Saves me an unnecessary trip into town and (possibly) a charge for his time. Much appreciated.
I love this place and all the expertise.
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You did have me wondering 
Is your phone ok now, it had maybe tried to do an update and got stuck in a loop.
It’s not just a case of flipping off the rear case on the A21 to take out the battery like on older Samsungs, the rear case is glued on and has to be heated to remove the cover.
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Impossible in 99.9% of modern phones without specialised tools.
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Thanks Griffin. It is absolutely fine.
Most of the time two plectrums, a ring sucker and a hairdryer is all that’s needed 
Such a shame, though understandable if you live with someone who regularly submerged her phone.
My S7 had a removable battery; you could even use a super-size one (which came with a new phone back).
Which will get you the cover off, not necessarily access to the battery connector without more work with ludicrously small torx screws - not to mention needing to replace the adhesive to get the phone back together.
There are very few phones with removable batteries these days.
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Yes I wouldn’t risk it myself (having once bricked a fairly expensive phone trying to install one of those “unlock your phone yourself to use any network” hacks) - take it to an Apple store (if of a fruity persuasion) or one of the many places that have popped up in recent years selling phone cases etc who offer phone repairs.
I have only ever had to replace one battery and one usb port but quite a few glass backs on folks phones.
Even with cases on, one drop on one of the corners usuall cracks the glass back, fortunately replacement back kits are relatively cheap but take a bit of time to do.
One of my neighbours kids phones I’m doing today.
I highly recommend Spigen cases. Have been using them for over a decade now to protect iThings as I’m a clumsy git at the best of times.
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And a recommendation from me too. Spigen make the best-protecting cases I have come across in many years of searching.
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It’s not really the case with most of them it’s the glass back corners are vulnerable to cracking, this one had a phone armour case with silicone corners and it still cracked.
Yes I’ve had those in the past too. I currently use a QuadLock case because it has a socket on the back for their motorcycle mounting system. However it’s also made of quite thick rubber so I think it would protect my phone quite well if I dropped it.
The thing I like about my Spigen case is that the corners are made of 2 layers of different plastics with an air cushion in between. One of the family once dropped my phone from about 2m and it landed corner first on some paving stones. The corner of the case was scuffed but no damage to the phone body, screen or protector.
On a lot of the Xiaomi, Samsung, Honor etc now, the back/battery cover is made from glass and wraps further round to the main frame of the body, so whereas when you dropped it onto the corner before it hit the main body frame, it now hits the corner of the glass rear cover which tends to break, not all new esthetic improvements are for the best.