Help me please???

hi everyone, its been 4 days ive been searching the net and on you tube to fix my iphone 3G

basicly i replaced the rear cover, so stripped it apart carefully and put it back together carefully.

now it wont turn on, ive left it for hours to charge, still no joys.

right firstly if i try to turn the phone on, absolutly nothing, tried holding both buttons etc still nothing.

if its on charge or pluged into my laptop it comes on with the apple sign then off again, if i press the power button again the apple sign will come on for a few seconds then go off.

ive tried the reset thru i-tunes, then at the end of it says error code 1601

ive tried different USB ports on the laptop, used a brandnew ipod USB cable etc, still comes up error code!

ive tried downloading blackra1n aswell to get it to go, but when i click on it to start up a box comes up "make it rain" i click on it and it says "waiting on device" but the phone is all ready hooked up and ready to go.

thats puzzling me is its totally dead without any source of power to it, i really dunno what else to do.

any help would be much appreciated

p.s i dont have the sim card in it atm its in another phone, this wouldnt cause it to not start up?

 

anyone?

 

if i reinstal itunes will i loose al songs i have on it?