"Mine was ordered straight through 3DR."

"It looks as if the 3.3v regulator problem is mainly affecting nav sensors. Doesn't seem to apply here.

Any one else have any clue?"

"I've heard of this issue, and hope to god it's not that. I am a broke college student with a kid who plays hockey- Took me a while to be able to buy the APM in the first place, I can't get another for a long time. I've only have 5 test flights on…"

"Thomas-

Good news and bad. The good news is that before, the double red flash didn't last longer than a few seconds while trying to connect, where as now the double red "heartbeat" flash is on when hooked up to USB.
The bad news is that I still get…"

"Thomas,
Thanks for the quick reply. I haven't tried that because I read somewhere that you should avoid hubs with APM. I can try that later tonight and post the results.

Thanks- Jim"

"OK, guys-
Sorry for the long gap in posts here, it was final exams week.
I show the exact same settings in my pc as the ones you posted.

Still no luck, and getting real discouraged.

Jim"

"Baud rate selected is 115200k.
I'll follow this link's process when I get home from campus today. 

Thanks,
Jim"

"The selections in the drop down box are AUTO, COM3 Mega 2560, UDP, TCP.

I've tried both Auto and Com3.

Jim"

"Crady-

Thanks for your input! To answer your questions;
1. Yes, I can use my Uno just fine on Com5.
2. APM is assigned to Com3
3. I could lock satellites last time I tried, a few months ago.
4. I have not tried to arm it, I will try that tomorrow-…"

"Went through and reinstalled drivers and Arduino IDE (which I need for other projects) as well as MP.

Still no luck.

Any other ideas?"

"Looking at my device manager, there are no conflicts. Arduino IDE has the latest drivers installed. I noticed, however that the Uno was listed under Com 5, not Com 3. I went back to arduino and tried to upload a sketch to my Uno on Com 5 instead,…"

"Thanks, I will try that when I get home. I'm thinking you might be right. When I updated Windows 8 to 8.1 a while back my Arduino IDE stopped working. I reinstalled the IDE and still couldn't connect to my Arduino Uno to upload sketches.

I don't…"