When i receive a message, my e73 doesn't make any noise. i've taken out the battery several times, turned it off and on, let the battery die, but it's not working. the only thing that indicates that i have received a message is the light around the cursor, but that stops after about a minute. and this happens to all of the profiles. if it is supposed to vibrate, it won't, and if it is supposed ring, it doesn't. does anyone know how i can fix it?

check the fuel filters and do any of the gauges read anything weird?

Perhaps, it is a faulty PCU. Try by shutting off power and using another but wait a few minutes before turning it on again.

Sounds like a defective unit. You've tried everything their support people would walk you through.
Sorry...

Mine would work fine until I turned on my wireless headphones...then the mouse would move a little stop.....move a little....then stop.

I made sure my headphones were on.

I turned off the mouse, moved the mouse reciver to a USB port on the front of my computer (the mouse reciver and the headphone receivers were next to each other on the back of the computer). I turned the mouse back on.

The computer imediately gave me the "installing USB driver" notification.

When it was complete....both played nicely together...no more problems.

Might one enquire how you have assessed the intelligence of the connecting lead ? I know of no definitive tests for this area of electronic equipment.

Ignition module or crankshaft postion sensor . Test it in the vehicle , test light , volt meter . Videos on youtube .
2004 Saturn Ion 2 2 Misfire Case Study P0300

Your camera is obviously defective. It may have been a return and resold to you. In any case, you should return it immediately....this problem will only get worse.

Make sure that the ground you are using is solid and has a clean connection.