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Logitech does not offer repair for these cameras. Self-repair can be attempted. A reset could be done on the camera, to try to 'fix' it or get it operating again. Have you any electronics expertise? if so, you can try opening the camera if it is badly inoperative and no other less invasive measures work, and try several things to get it working (hopefully).
Where are you located, or what state at least? depending on your location, there might be repair servicers for Logitech cameras of this type, nearby to you.
(But first of all: What is wrong with the camera?)
If it's an Ethernet cable camera, that makes it easier to test.
Basically, the only way to be quite sure, quite easily, that your powerline network isn't at fault, is to test the camera with Ethernet connection but not through the powerline net... very locally to the computer, e.g. through a local powered hub.
Have you done that test yet?
How would you view the camera on the computer anyway?
- set an IP address for the camera that is accurate to = whatever IP address it actually is at? and then access it that way?
- it might help if you had the camera hooked up through a hub or router's common ports. That would obviate certain problems with the cable to use and the IP address assignment etc.