mobile

Hi guys, I was wondering if i could get some help here before resulting to rma .

I flashed a custom kernel over my custom rom (rom was initially working great before i flashed kernel). But it turned out the kernel i flash was the wrong one for the smp600. I did some research last night and flashed several stock firmwares (..CNH1, ..COB1, ..BMK1, ...) via PDA in ODIN. i managed to install custom recovery (TWRP) and used that to wipe cache and Dalvik - didn't quiet help. I also performed factory reset in both stock and custom recovery, no change. These were the outcome

--Tablet is recognized by pc in download mode only and ODIN works.
--After boot into android there is serious lag, restart after a few seconds and the cycle continues.
--After a while TW settles but the note is not recognizable by pc via USB
--Also instead of the first "Galaxy Note 10.1 2014" that first appears when note is turned on, the whole screen just displays several colored lines as if it were actually broken.

I would really appreciate the time you take off your busy schedule to help me with this, thanks.