apple logo reboot

Hey all! My mac has been a rockstar since I’ve owned it! A couple days ago it was working fine, I left to go make dinner, came back and it was in a reboot loop. It would display the apple logo, start the progress bar, load 1/2-3/4 of the way, flash to a grey screen, and reboot. Once I saw it...

I was recently turning on my old iphone 4 and it randomly shut off.. stayed on the little loading circle for about 5 minutes until i force shut it off... then when i went back to turn it on it had the apple logo with a loading bar underneath? I force shut it off again before the bar finished...

i got an iPhone 3G,and it ran 4.2.1,so i got 3.1.2 on it,and THEN,LATER i Jailbroke it,using blackra1n on my mac,then i did it! i hit settings>general>Reset>Erase all data and factory reset! i ended up getting a combination Apple Logo+Spinning Wheel. i REALLY NEED THIS FIXED,with NO POWER...

So I had gotten my battery fixed on my iphone 6 , It worked fine . The it started doing this thing where the screen would go black and pressing the power/home would not do anything. Next it died and it would show the battery then the apple logo and repeat . I went to the store thought it was a...