S2 keeps shutting down after "Samsung G. S2" logo appears. Constantly - Galaxy S II Q&A, Help & Troubleshooting

All of the sudden my S2 keeps shutting down. I turn it off, the first screen appears and it shuts down. And it does that constantly. Perhaps my ROM (carbon KK 4.4.2) got corrupted. Anyway I deleted partition cache, dalvik cache and in the end I've done factory reset. None of this helped. So I downloaded CM12 i flashed along with Gapps. It still doesnt work, still the same situation. I think I should install a bootloader, but I can't find one for S2 with Carbon ROM KitKat!!!
So what should I do?

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[Q] Rebooted and got stuck. CM-10.1

My Tab is not feeling well.
I have installed CM-10.1. Everyting worked perfectly. Until it didn’t work at all.
Suddenly it boots and gets stuck at Bootup image "Samsung GALAXY Tab 10.1".
It all happened just like that, and during some update or alteration on it.
And until this happened the tab worked perfectly.
Have tried:
Restart. Stuck at Bootup image "Samsung GALAXY Tab 10.1".
ReFlashing the CM-10.1-20130119-nightly-p4.zip. The whole process works normally until it will boot up and then it gets stuck.
Wipe dalvik
Wipe cache partition.
Wiped the screen.
ReFlashed the CM 20130108 (which was the first I put in before I update via settings)
ReAdded a new bootloader via Odin.
Fix permissions
Nothing helps.
What differs.
Tried factory reset. It starts running the reset but after aprox. 10 sec. the Bootup image "Samsung GALAXY Tab 10.1" turns up.
When I insert the charger, the battery symbol comes up, but does not show that it is charging. Stuck on the battery with the star/sun in it.
Tried to restore the saved backup in Nandorid. "Could not open directory"
What has happened? And how do I do now?

Samsung Galaxy S2 not booting

I rooted my phone without any trouble for months, and its been working just fine, until now! Then, I had to do a factory reset. The normal procedure, SETTINGS> PRIVACY> factory reset. The phone then never got past the boot logo. It starts to load, and just gets stuck at the Samsung logo, and nothing else. there's two lights glowing from the capacitive buttons, and that's all. I'm on 4.1.2 JB stock rom. Later, I tried to enter recovery mode, and did a wipe, and cleaned cache partition also. AND, the phone just sprung to life, the whole first time set up thing. I started filling in stuff and the phone just shut down again, and if I tried to reboot again, it doesn't get past boot logo. But if I wipe n do it, it happens but shuts down immediately Please help!!
Sent from my GT-I9003 using xda app-developers app
Boot into download mode, get a stock rom from Samfirmware, flash it with Odin (How ? Thread stickied near top of Q&A).

S3 (I747) Powering off During Boot

Started two days ago. Phone would randomly power off and boot back up. Finally it shut off and would not power back on. I had Cm11 installed with CWM 4.0.4.6. The phone powers on after inserting the battery. The Samsung logo flashes and then it shows the "Galaxy S3" logo with the CM logo below it. The phone the powers off. I have done a factory reset, cleared both caches, formatted the system folder, flashed SlimKat from recovery and tried another known good battery. At this point I figured I would reflash CWM but if I put the phone into download mode, it powers off after just a few seconds as well.
If I boot the phone into CWM, the phone stays on as long as I want it to so it makes me think this might be fixable. Just need some help.
Ask in your device forums.
My apologies. Didnt realize there was another S3 board. Found and posted there.

samsung galaxy tab 2 10.1 gt-p5110 stuck in boot-loop

i own a samsung galaxy tab 2 10.1 gt-p5110 , i got it off my cousin who doesnt know anything about tablets etc.. she told me it just broke.
now what the tablet does is when ever i press the power button to power on, galaxy logo appears as normal and it goes straight into recovery mode.
things i tried:
wipe factory data
tried wipping cache but tablet said "error" and rebooted so i installed twrp custom recovery and wiped cache with no problems this time, but table issue didnt solve
flashed stock firmware via odin ( 2 different ones) stil same issue after succecifull flash, tablet would reboot and the green android man would appear saying "updating" but then would say "error" and reboot back to stock recovery with "no command" at the buttom of screen.
any help highly appreciated.

my phone is stuck in bootloop, but sometimes im able to turn it on

i had my phone for about 2 years, it has been rooted ever since i got it and its running custom rom and custom recovery CM 13 on android 5.0.1 and TWRP . about a week ago i was charging my phone, when i unlocked it, i'm unable to go to the home screen because whenever i do that, google app crashed and the phone redirected me to the recently used app tabs, then i tried to reboot my phone and it went to safe mode but then i restarted it and its stuck on bootloop. so i let it be for a while, then it show the "android is starting" tab and "optimizing app number "xxx" out of "xxx" and after it finished, again it is stuck in CM's logo. however, then i put my phone to fastboot an restarted it and i dont know, it turned on again after 2 boot loops. a week after, my phone ran out of battery so i tried to turn it on but it wont , after reading threads on the internet, it suggested me to erase the cache and the dalvik cache. so i did and it turned on. today, i ran out of battery again and i erased both cache and dalvik cache, but it wont turn on.. i have no idea what's going on with my phone, and im a newbie so please go easy on me thank you.

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