i just installed the latest AMI bios 2.02 in 6028 SBC.
same boot issues.

with this certain usb device plugged in (EZB USB) then win 7 pro will not boot. part way through windows logo screen it reboots and bios screen comes up.
if i disable legacy usb support in bios the problem disappears, but then my acronis rescue disc (Linux) has no kybd or mouse support.(acronis wants usb legacy support enabled)

tried recommendation to use devcon script to disable port at shutdown and then restart at boot up. i disabled (did not try to automatically re-enable yet) and port was disabled (i checked it by trying to run EZB application), but at boot up with legacy usb support enabled i got same result: windows tries to start and then reboots.

i have either not found bios solution on this SBC or I have not provided the right setting or combination of settings.

other recommendations are less palatable solutions like adding a relay that disconnects power to EZB USB or a device/relay that disconnects the USB connection until after boot up. the issue with this is that there would have to be some way (handshake) of the PC telling the PLC that boot up has occurred so that power or USB connection may be remade and then the PC would have to start the application program that looks for the EZB USB. EZB USB must be connected & powered when EZB application is started. I would consider this if i could get a commercially available handshake between PC & PLC.

i notice other USB settings in 2.02 but again not sure what to set them at.
notably: under chipset\USB config\USB PRECONDITION & XHCI MODE & USB PER PORT DISABLE CONTROL.
Is there something here you would recommend to try?

ami bios & start up manual attached.

thank you to all of you.

was a bios issue.

needed to disable legacy usb...

rebooted many times today with no problems!

thank you for your reply.

so let's see if i have this right...
1. install DEVCON on PC (BTW the file devcon.7z in example thread would not run / open / extract - do you a place i can get just it?). I take it that LGPE script calls devcon and I do not need to put devcon somewhere so it runs each boot up.
2. find HW ID(s) for violating USB device (if more than one is listed then do i disable and enable all of them? see file i attached showing multiple)
3. in LGPE / local computer policy / user config / windows settings / scripts (logon/logoff) i would put in scripts you listed with HW ID(s) i looked up.

so i would then NOT use windows scheduler?

does the LGPE run before the programs in startup folder? (the ones that use the USB device in question). i hope so.

on another note i am having trouble getting LGPE to run on my home PC. getting "MMC could not create the snap-in".
not listed as an available snap-in in MMC
may not be issue when i get back to the actual PC at work tomorrow.