Thank you for checking,
Unfortunately, the issues you are experiencing are symptomatic of an internal hardware defect, meaning a faulty main/control board, which is what processes the signals and manages the inputs. This issue could be a manufacturing defect, but is also often caused by a power event (shock/surge, prolonged over/under voltage condition, etc).
This could also be the result of age related wear and tear; as a 2008 model, that type of failure wouldn’t be surprising. This system is significantly past its service life at this point.
There is one step you can take here, both as a possible fix, as well as a diagnostic evaluation:
1) Unplug the power cord from the outlet
2) Wait at least 1 hour (60+ Minutes)
3) Press and hold the power button (on the set, not the remote) for 60 seconds
4) Keep holding power button while plugging back in, and for another 60 seconds after. When plugging back in, go directly to the wall outlet, bypassing any power strips or surge protectors.
If this reset process does not work, it would unfortunately confirm an internal hardware failure.
This is something that would require repairs to correct; however repairs are simply not feasible as parts are not available. This is the biggest downside of this type of system, as once a single part fails, the entire system becomes useless.
While it could be fixed, you'd be in the $300+ range for repairs, assuming used parts and components could be found.
However replacement will make more sense. You can get a brand new and updated system with a fresh warranty in the same price range.
Depending how you’d like to proceed here, I can help with finding parts, finding a repair shop, or recommending replacement options. Just let me know.
Best regards, ***** ***** for the news,