How to get files off a working 2010 imac with black screen
Our 2010 iMac (OS10.12) starts up (I can hear a chime) and sounds like it's running OK but the screen is black. I've tried all things suggested in other posts and have concluded that the screen is absolutely dead and the iMac has consequently reached the end of its days. But I need access to the disk to copy files which haven't been backed up and then wipe the disk before disposal.
I have read that I should start it in target mode (by pressing T while starting up) after connecting with another computer ideally by firewire cable or if, not, by ethernet cable. I don't have a firewire cable with the right connectors to connect to our other iMac (2011, OS10.13) so have tried with ethernet cable, connecting each end to the ethernet socket in the two computers (I presume this is right and I don't need to connect it via the modem?). Do I need to change any preferences? I restart the broken iMac holding T (for how long?). I can't see what's going on so don't know what it is doing, if anything. I read that I should see the disk image on the other computer, but nothing comes up.
Where am I going wrong? Is there another way of accessing the files on the disk? Please help. Thanks.
iMac 21.5″, macOS 10.12