Problem with UPS

[cuppy]

I have HP DL server and HP Rack UPS 3000. Installing PowerManager 4.1 on server under RedHat5 I always get error of not finding any device though UPS is connected to serial port. And it's strange 'cause at my first installation of PowerManager 4.0, this UPS was found by this server, then i decided to reinstall new version 4.1 and failed. Now UPS can't find by either PowerManager 4.0 nor PowerManager 4.1. Any ideas?
PS. CLI in iLO2 bios is disabled.

[Peter_505]

Maybe I'm mistaken but the versions of Power Manager that you are using are not supported under RHEL5.

[cuppy]

Thanks Peter for trying help but my problem was resolved by unplugged electric suplly cables from server, waiting for some seconds, plugging again ... and "voila" my server found UPS through Power Manager 4.1.