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right pisces said to go onto settings - about device right? so im just going to read you out everything that it says which is from top to bottom;
Software update
Status
Legal information
Model number-GT-N7100
Android Version - 4.1.2
Baseband version - N7100XXDLK7
Kernal version - 3.0.31 - 1071214
se.infra@SEP-117 #1
SMP PREEMPT Wed Mar 27 10:33:53 KST 2013
Build number - JZO54K.N7100XXDMC3
that is literally everything that is on 'about device'
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what do you mean by recovery? how do i find these things out, this is my first time ever using an android ..
guys another problem has occurred and now i think this really cant be fixed. right.. you know when you switch on your phone and that purple light spins around then 'Samsung' appears basically it keeps doing that litrally, i can't go into anything now it litrally keeps doing this over and over again non stop :
its still doing that up to now, iv tried taking out batt/sim ect restarting but its doing that over and over again, its been like 2 hours and its still doing the same thing. i think i might just send it back to the shop
i'll let you know how it goes and keep you updated , and i will do as you said and take the sim and sd card out 
when i connect my phone to my laptop it says USB device not recognized iv been looking at all youtube tutorials all forums about this situation and there is no solution what do i do? :/