In the archives of this forum there are a couple of posts about the Jornada causing computers to reboot. http://www.computing.net/pda/wwwboard/forum/21.html The attached link below is to another forum where I have posted about this issue. Here is the text from that post. It sounds like the problem you are having is related to a problem I have been having with my 548 when USB syncing. My unit has been causing my work computer's USB mouse to stop working whenever I put the 548 in the cradle. And at home would sometimes hard reset my computer when I put the 548 in the cradle. After making sure there were no broken contacts or wires in the Jornada or the cradles I noticed what the problem was. Referring the attached jpg picture file. The picture is a hand drawing (don't have a digital camera) of the bottom of the 548 where the syncing connector is inserted. If you look inside of this opening with a magnifying glass you will see the end of a printed circuit board (PCB) and a row of gold plated electrical contacts. The right 4 contacts are used for USB (the rest are probably for the RS232 contacts). The 4th contact from the right is ground. The other 3 are the contacts are used by USB to communicate between the computer and the 548. Ideally when the 548 are inserted into the cradle the first contact in the 548 that should connect to the cradle are the ground contact and then the other 3 after that. This prevents noise spikes from occurring and is standard practice with PCMCIA and CF cards for ‘Hot Swapping’. A normal method of achieving this is to make the contact (or pin) for ground longer than the other contacts. If you look real close at the 548 PCB you will see that the ground contact is intended to be longer than the other contacts. It extends almost to the edge of the PCB. You will also notice that there appears to be very narrow copper traces on the ends of the other 3 contacts going to the edge of the PCB. These narrow traces are the problem. They are part of the PCB ‘manufacturing and test’ process and should have been removed before shipping the units. (Quality Control at HP should have picked this up.) Because they were not removed they are now causing all or some of the other 3 contacts to be connected before the ground is connected. This, as I have seen more times than I care to, messes up the USB bus. On my 548 I VERY CAREFULLY used the tip of an xacto blade to remove these narrow traces as far up as the main wide portion of the actual contacts. Try to make sure you don’t let the scraped away traces fall into the unit. These are made of copper and potentially could cause a short in the unit causing it to fail. You might stuff a little cotton into this area before scraping away the traces to prevent this from happening. I no longer have any problems with the USB. Even while inserting with the 548 turned on. As a side note, I am a Sr. Hardware Engineer who has been designing PC boards and various electronics circuits for just over 28 years.

Here is the link I forgot to attach the first time.