DL380 G4 HP Rack

[Peter Kircher]

On the floor the DL380 works correct but if i put the Server in a HP 19" Rack the server makes serveral errors.
Server hangs by startup or by windows start and the monitor is black (no error messages)
the LEDS on the HD lights yellow and so on.
I need some help for find the mistake!

[Sizhuk Vitaly(ru)]

when you back on the floor the DL380 works correct?
only in rack error?

[Peter Kircher]

Back on the floor the server works correctly!

[Sizhuk Vitaly(ru)]

Monitor is black? you see Post ? or no

[Peter Kircher]

Sometimes it stops after POST and hangs by Windows announcement sometimes before!
In this rack also is an old ML370 and this server works normal

[Sizhuk Vitaly(ru)]

verify airflow? front to back
temperature in server.?
open server cover verify all divice..

[Peter Kircher]

I don't think that the problem is from the airflow because the problem comes immediatley!
I supposed the problem is on the power circuit. How can i check if the ground of the Rack is OK. (I am not an electrican!)