[HELP] Nexus S can't boot recovery

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http://forum.xda-developers.com – Hi all, Been given a Nexus S i9023 by my brother who has been "tampering" with it and now it seems a bit messed up. When booting up - it gets stuck on the "Google" screen with a padlock on it... I can get into fastboot and I can flash recovery but when I attempt to load any recovery - I get that same Google screen with the padlock! I've downloaded a stock rom and even flashed system etc via fastboot but that still gets me nowhere past the damn padlock!! I've tried to "fastboot boot recovery.img" and I still get the Google screen with the padlock but it sa (HowTos)