client specific problem

[Valerio Pachera]

Hi, I have a class room with "recent" pc.
I have trouble with them: they boot by network but do not always
complete to load ldm.
Sometime I get a black screen, sometime the preloader just hang up,
and sometime it works...

I'm testing now on one of the class room client and I get the above problems.
Using another old pc I have (a pentium 4), I do not get the above problem.

I also tried to use fat client configuration but nothing changes.

The pc has an intel 82g33/g31 express integrated graphic controlloer
and
atheros comunication ar8121/ar8113/ar8114 network card.

Cpu is a core duo.

I tested pc ram and it's ok.


When I get black screen or it hangs on the preloader, the last message
on /var/log/syslog of the server is
  size of exported file device is 12345678

When it work, ather the 'size' message I see
  disconnect request received
  child exited with 0

Any advice is wellcome