Why does SCXI 1325 give a NaN output at all channels?

[Jags]

Till yesterday SCXI 1125 was working fine. But today the values that I am getting from all its channels is "NaN". No error is given.
When I tried running the Test Panels thru NI-MAX, SCXI 1125 still gave a NaN output, while 6040E, 6251 and SCXI 1142 did not.
Can someone tell me what is the problem and how it can be rectified?

Setup :
PXI chasis consisting of PXI 6040E and 6251
SCXI 1000 chasis consisting SCXI 1142 and 1125

Connection to SCXI 1000 chassis is thru PXI 6040E

PXI 6040E connected to SCXI 1142 (accessory SCXI 1304)
PXI 6251 connected to SCXI 1125 (accessory SCXI 1313)

Data collection thru Parallel mode

Thanks

Jag

[Kodeeswaran]

check the cables are propely connected, have you installed any new software in that PC ?, you check that any printer drivers or any program is intruppting the driver files of the NI card, Usually this problem is because of of some driver issue, please reinstall the drivers or disable the printer drivers from the startup which will stop the NI drivers Loading initially. else see wheather you hardware was not damaged. this is rare,check the driver software,

[Jags]

Thanks Kodee for your reply.

Well this is what I have done so far :
a) Removed all the SCXI modules and reconnected them. Checked the wiring.
    But still get the same result "NaN" for SCXI 1125
b) Reinstalled DaQmx drivers
     Still the same NaN result for SCXI 1125

Also I have now realised that when I try to measure an analog signal thru the module SCXI 1142, I get some varying signal initially followed by a steady 5V signal.
I am not sure whether this fault was present yesterday when I first came across the NaN problem with SCXI 1125.

So right now, SCXI 1142 gives a steady 5V output while SCXI 1125 gives a NaN output.
Could you suggest what I should do next?

Also in your reply you had asked me to check whether any printer drivers are interuppting NI drivers. How can I check that out?

Thanks

Jag

[Kodeeswaran]

some Hp printer drivers will stop the NI DAQmx Driver loading properly hence it doesnot able to read the signal through the hardware, if this DAQmx driver was not fully loaded or ant interruption it will not read analog signals, does this only for analog channel or for all the channels..  to disable the printer driver from startup you should edit this in windows MSconfig.sys file. it should be done carefully else your OS might get corrupted.