Help fixing SMS

I just picked up an SMS complete with working powersupply and RF adapter, pad, and light gun for 7$ at the thrift store.

Unfortunately, the unit itself doesn't work. I opened it up hoping it was just a fuse I could fix, but I can't find any fuse.

I looked on the web, and the only page I found just had you check all the links up until the 7805. But I have power getting all the way to the "I" pin of the 7805 (and also to one side of two caps). But there doesn't seem to be power anywhere else.

[edit]

Ok, so I answered my own question. The "O" pin on the 7805 power regulator reads 0, which it should read 5v. So it appears I just need to replace that. Hopefully they have them at radio shack.

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Thanks,
 
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