OK I have some PC's (soon to be macs) and a Mac. I have a Lexmark X5150 hooked up to one of the PCs and an HP deskjet 5650 hooked up to the mac. My PCs can print to the Lexmark fine, however, my PC's won't print to the mac and the mac won't print to the Lexmark. How can I fix this? I have the Mac and the PCs networked, but the Mac can only see the PCs (the PCs can't use the mac's files) Its really weird. BTW, I have an airport express as my router.