My remote was working then just displayed a welcome page and wouldnt do anything. I replaced the batteries - re synced with the pc and now it just shows the activities screen but will not acknowledge any buttons - nothing happens.
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Remove the battery and allow the voltage on the circuit to fade off. now reset the battery and see if the remote works. If there was any battery leak then the pcb can be damaged due to corrosion. please check this link for tips to repair:
Does the 550 have a "sync" button to finalize the data installed during online programming and/or did you follow all the steps to complete the proramming for the 550? If you did, and it still doesnt work, I suggest contacting the staff at Logitech or bringing it back to the dealer from whom you bought it for the purpose of clarification or return. Or, maybe the dealer can program it for you.
Hmm I havent heard of this before. Did you try updating the firmware on the remote?
1. Remove the battery, press and hold the 'OFF' button, and re-insert the battery. The screen will display 'Safe Mode!', or the 'Activities' button will be lit. 2. Connect your remote to the computer. 3. Launch the Harmony Remote Software, and log in. 4. Click "Downloads" at the top and click "Firmware". 5. The remote will go through the firmware update. 6. Select "Yes", and click NEXT to update the remote. What exactly does the error message say?
I got the same issue with mine, and hooking to the computer and upgrading the firmware worked for me. I first had to take the bateries out and let it sit for 24 hours so it would loose the codes inside. No problems after that.