JTAG Chain problem - no device detected (Tried with multiple boards)

Thanks for the reply

After running jtagconfig -d the USB-Blaster LED stays

steadily active and I get the following

vague output

1) USB-Blaster [USB-0]

Unable to read device chain (JTAG chain broken)

Captured DR after reset = ()

Captured IR after reset = ()

Captured Bypass chain = ()

With the JTAG Chain Debugger if I run an integrity test I

get the following equally useless output :(

Error: JTAG chain problem detected

Error: No device detected

I'm getting the feeling that it is the USB-Blaster causing the

problem seeing as it is unlikely that a hardware fault has

developed in 6 previously working boards. Is this a

reasonable assumption?

# EDIT#

I've have just finished trying on the other computer setup

(Ubuntu 32-bit) and the same problem occurred. So I guess

that rules out a problem on the computer end. Are there

any other places I could look while I wait for another

USB-Blaster.

Thanks,

Mat.