I am running Win XP with SP2, AMD3000, 784mb RAM. The MOBO has one serial connection, designated Com 1. This connection has worked before (albeit a few months ago) but it is not communicating now. There are no conflicts, it is present and working properly in device manager. System Info shows it is there and "busy". I have tried a different serial device and the results are the same for both, it is not available. Also I have tried one of the devices with a USB > serial adapter and it worked, so we can discount the external hardware.
I have installed a USB Bluetooth adapter but it is not plugged in. The only thing that gives me cause for concern, but it should'nt, is Activesync connecting a Dell PDA with USB cradle.
I have turned off my AV softare and firewall but it still does not work. (The XP firewall is off)
Therefore, how do I check what software could be using the port?
What else could be blocking access to it?