can't flash any custom rom in CWM HELP!!!!!

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http://androidforums.com – Every time i try to flash a custom rom the rom flases in 5-10 seconds and then phone reboots and gets stuck at samsung galaxy s3 GT-i9300 black LOGO. I can only flash a rom with odin. I have tried touch clockworkmod and simple latest versions and cfroot one also, and i have tried flashing from internal and external sd card...help pls (General)