I have just been given a 2008 iMac which is running El Capitan 10.11.6 , this is my first ever Apple Mac computer , so I'm completely new and need some help . I have a home wifi set up , with a router connected to the internet . Currently I also have a Windows 10 laptop that is connected to the router via an ethernet cable , I also have my LG smart tv connected to my home router via another ethernet cable . I can play movies stored on my Windows 10 laptop directly to my LG smart TV , using the ethernet cable connection . Now I am trying to do the same and play movies stored on my iMac's internal HDD , the iMac is also connected to the router via another ethernet cable, but I just can't seem to find out how to play movies on my LG tv from my iMac . The LG smart tv can find my windows laptop in its connected devices option , but it does not show my iMac. In the iMac's system preferences Sharing option I have the file sharing set to on , the remote location set to on , and in the share Folders option I have my folder where the movies are , set as on with read and write permission set as on . In the Options box I have Share files and folders using SMB , set as on , and my computer account name , set as on , But still no luck ...Any advice most welcome.