Had a quick look for threads on similar issues and couldn't find anything so here goes... I have a late 2012 iMac which from day of purchase I have used with an HP 5510 wireless printer with no problems at all. Similarly, I use PS3 media server to stream media from my iMac to my PS3 to play. I have found that ever since the the last OS update neither the printer or the PS3 media server is working. It may well be coincidence that neither has worked since the OS upgrade but obviously I suspect the software upgrade is the reason for both to suddenly stop working. Anyone having a similar experience or know of a potential solution? Thanks in advance.