Samsung Discover SGH-S730M having problems booting

I bought this off craigslist, and basically if i boot it normally, it has a samsung logo, then gets a white screen of death. If i boot it into recovery, it boots into a Samsung Logo, then a Samsung logo with a yellow triangle with an exclamation point. Finally, if i boot it into download mode, IT WORKS! i have tried flashing recovery cwm into the phone with odin but dosent work. Any ideas?

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