My phone won't turn on - Xiaomi Mi A1 Questions & Answers

Hello everybody,
Since I tried to flash Lineage OS on my phone, I can't turn it on anymore. The screen is black, and when I press the power button the phone has short vibrations with an interval of approximately one second. When I press volume down + power it is the same, as well as with volume up + power.
When I connect the phone to my computer, again it vibrates at short intervals without being recognized by the computer. Finally, if I plug it in the charger, it also vibrates.
I can't access the fastboot mode or flash on twrp, I can't seem to do anything.
What is happening to my phone ? Did I brick t ?
Cheers and thank you.

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OnePlus Two boot issues

Hi guys,
I've got some problems when trying to boot my OP2.
First of all, my phone won't power on when holding the power button. There is no reaction from my phone. When connecting to a USB port of my computer, the phone will power on showing the battery charging indicator. I tried several things:
- Power cycle: holding the power button for 20 seconds 5 times
- Holding the power button when connecting my phone to my computer: the OnePlus and Powered by Android logo, after a few seconds, battery charging indicator comes up
- Holding the volume down button when connecting to my computer: the phone is stuck at the OnePlus logo and Powered by Android logo. I have to disconnect the battery to turn off the phone. (Yes, I opened my OP2)
- Holding the volume up button for 20 seconds when connecting to my computer: no reaction, phone stays off.
Yesterday when holding some buttons, I ended up on the fastboot screen, but I don't know the combination of keys and duration to end up in this screen. When in fastboot mode, is it possible to reset this phone, because I can't open recovery mode (volume down button)? And how to I enable fastboot mode?
Might this issue be caused by a broken battery or another hardware issue?
Thanks in advance XDA-hero's!

Boot Loop - Black Screen - Vibrate again and again

Hi
I tried to flash ZUI 2.3 with QFIL. but some errors appeard. so i Stopped flashing and i rebooted my phone.
but now the screen is Black and the phone vibrate every 10-15 seconds.
when i Press and keep power Button. there is two kind of vibration. a quick vibration and a longer vibration. but nothing happening by holding power button.
i tried holding Power button & Vol Down nothing happened.
power button & vol Up , nothing happened.
power button & vol up & vol Down ... also nothing happening...
my PC does not recognize the phone ... so i cant use adb.
So I'm desperated . What should i do to fix this ?
You can refer to this post, save your cell phone.
http://bbs.lenovomobile.cn/zukedge/t678962/
my PC does not recognize the phone. i dont have any access to phone. i only see the black screen and periodic vibration

can't make hard reset nokia 6

hi
my little brother made a pattern lock and forgot the pattern, after many tries the phone erased everything
he doesn't know the email he used it on phone or the password
now it boots welcome screen and asks for the old email, i did tried make new but it doesn't works.
so i figured i should just wipe everything with hard reset
from what i read and saw some videos, i should turn off and then connect to power then wait a little, then press power and vol up for 10 seconds then release my finger from the power button.
i tried it many many times but it doesn't works.
any help?
Switch off your phone,then connect the charger to your phone and quickly press and hold volume up and power buttons,after the screen is blinking a bit release power button,but hold volume up until you are in recovery mode.
it doesn't works, it's like the vol up doesn't work when the phone is switched off, but when i power on the phone and finish booting i can vol up.
i can enter download mode (vol down + power) but it doesn't do anything.
Marius.Petran said:
Switch off your phone,then connect the charger to your phone and quickly press and hold volume up and power buttons,after the screen is blinking a bit release power button,but hold volume up until you are in recovery mode.
Click to expand...
Click to collapse
it doesn't works, is there other way for hard reset?
ok, managed boot to recovery mode, did wibe out data, after i restarted, it asked me the email that been used on the same device before format, however my little brother can't even remember the email he used.
Send it to Care Center...they will fix it

oneplus 6t stuck on unlock warning screen

Hi I had my oneplus 6t for 3 days and It's unlocked and rooted it was running fine until it runs out of battery and died and when I plugged it in and charge it the phone got stuck on the unlock warning screen now it doesn't turn off or on I tried the following:
hold the power button for 30 sec
hold the power button and volume down button for 30 sec
hold the power button and volume up and down for 30 sec ( this got the screen to blink only)
I plugged the phone to my mac and tried these command ( fastboot devices) (adb devices) nothing shows up on the cmd
Hello, i have the same problem. did you manage to solve it?
DrDuty said:
Hello, i have the same problem. did you manage to solve it?
Click to expand...
Click to collapse
Unplug the phone, hold the power button.
It will eventually reboot.
If not hold power and volume down.
There is a known problem after rooting, don't turn the device off and plug it in.
Unlock warning screen stuck "Reboot" fix.
Mine did the same thing the other day and after all the research found out it's Volume UP +Power press for as long as possible, for me it rebooted in 15 seconds. But I'd advice holding it as long as you feel vibrate and reboot. Tried more than few times for mine works Everytime. Don't plug it in while it's off and turn it on to prevent it from getting stuck again.

[Help] one plus 6t not vibrating or turning on after being plugged up

So I have a rooted oneplus 6t that was doing quite well for a little while now but for some reason today it died when it was hooked up to a charger. When I unplugged it and plugged it back in it did its usual vibration to signify it was connected but then it showed a qualcomm crash error (died too quickly to see it fully but it was small so I at least saw some of what it said) now when I try to let it charge it doesnt vibrate and doesnt even turn on when I left it on charge for a good hour now and when i hold vol up +power,vol down + power,both vol +power,or just power for their respective seconds to get the phone to respond. Tried looking for a answer online but none are similar to what i am having atm. Also my computer wont even see it either while it's like this. I've tried other cords as well to see if it was a cord issue and wasnt it's been sitting on the charger since 10:55 am est. Help?
It usually just takes some persistence. Usually the power + volume up will force it off, and then power it back on does the trick, sometimes it seems like it's all three buttons (which shouldn't do anything?) . I've had a couple times I've been just about to give up when it finally boots back up to fastboot.
Volume Up + Power while turning on will boot to fastboot.
Volume Down + Power while turn on will boot to recovery.
Holding Volume Up + Power should force the phone to turn off.
Volume Up + Volume Down should put your phone in Download mode for the MSM Tool.
Make sure you hold the buttons much long than you think you should have too.

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