No signal from CPU to monitor. CPU is working,what is the problem?Monitor is working fine with another CPU. Another monitor is tried but still no...

When CPU is working fine and no problem with
it, yet there is no output signal received from the CPU to monitor connected means that
some thing is wring either with the connection from the CPU to the monitor, or with the
monitor itself. It is not possible to say anything more about the nature of the fault
without examining the related hardware and the
software.

The fact that the monitor works when connected to
another CPU, indicates that the monitor is also OK. In this case it may be a question of
compatibility and/or installation of the monitor. If both the CPU are identical and the
monitor has been properly installed on both the CPU then the only possible alternative
left is that there is some problem in the way CPU and the monitor have been
connected.

Of course, the basic assumption that the CPU has
no fault may also be wrong. The fact that another monitor does not work on the CPU
points to the possibility that the fault is with the CPU. If this is the case than exact
nature of fault in the CPU will need to be investigated before a definite conclusion can
be drawn about the nature of fault.