samsung galaxy s3 gt-i9300 doesnt boot

hello
i am very tired now.i tried everything but got no success

here is what the problem is

While i was using my mobile.it suddenly got switched off and when tried to boot it.it goes into bootloop.i fixed the boot loop but now there is another problem.it doesnt boot.it only shows samsung galaxy s3 and goes black screen

here is what i tried


i flashed s3 frimware and installed it with odin.installed clockworkmod recovery and deleted davik cache and those parts (wipe data etc)
install cynogen mod 12 (idk whats wrong.but the installation hardly takes a minute.its like this

Code:

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installing,
updating
done

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within less than a minute it shows completed.
i can access recovery mode,download mode.
please help me on how can i start my samsung galaxy s3 gt-i9300
i have tried everything.please suggest me what to do

via xda-developers http://ift.tt/1pFtKDQ

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