Since updating my iMac to 10.5.2, my networked Mac Mini 10.3.9 has had issues with launching native Mac applications (Mail, Safari, Software update, Console etc.) but third party applications (Firefox, AdobeCS, Quark etc.) all launch/work fine. I think it may just be coincidence with regards to linking it to the Leopard update. I've zapped the VRAM etc. and it did work, but on restart the following day the apps would no longer work again (zapping VRAM does not work now). Is the battery dying? All the dates etc. are still correct.