Phone powers on then restarts. Any fix?

I successfully replaced the back of the screen. Thing is that i lost the sim lever. phone worked perfect without the lever, but i had to buy the part and fix it. bought the part.

after i put it in, the phone wont work.

first mistake i made was getting excited and forgetting to reconnect the display adapter. i tested connections while the dock was connected and partially shorted the display adapter. oops.

for a while the iphone booted then restarted when powered. it happened 50 boots. one time it fully booted, but with too much brightness, either the backlight at 200%, or contrast at 50%.

then it didnt work for a couple of days. plugged it in, and after 5 boots, ITS NOW WORKING!!!! just now.