USB Modem not detecting !

[pandyanb]

Hello Experts,
In my laptop, ealier in XP OS whenever I was connecting USB Modem, it was giving message "Power surge on USB Hub Port". Now, I have put new hard disk with a single partition and installed Ubuntu 9.04 on it. After installation, it was detecting USB for a day or two and I/net was working fine. But now the system is not detecting USB Modem et al. Is it because of some hardware problem or is there anything that I can check into Ubuntu? Please help me.
Many thanks,
Naresh

[D-cat]

You can check lsusb (type in a terminal window) to see if the modem is showing up on the bus. You can also check dmesg | tail a few seconds after plugging the modem in to see what the system log has to say about it.

My guess is if Windows was complaining of a power surge, then there probably is a hardware malfunction in the modem, but checking the logs might shed some more light in the topic.

[pandyanb]

You can check lsusb (type in a terminal window) to see if the modem is showing up on the bus. You can also check dmesg | tail a few seconds after plugging the modem in to see what the system log has to say about it.

My guess is if Windows was complaining of a power surge, then there probably is a hardware malfunction in the modem, but checking the logs might shed some more light in the topic.

Many thanks for the kind response.
The problem is not with modem because it is working fine in other system. And not only modem but any usb device is not recognizing.

Following is the output of lsusb :-
Bus 001 Device 001: ID 1d6b:002 Linux Foundation 2.0 root hub
Bus 001 Device 001: ID 1d6b:001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:001 Linux Foundation 1.1 root hub

Demsg | tail
[ 18.603556 ] [drm] Initialized drm 1.0.0 20060810
[ 18.807455 ] [drm] Initialized radeon 1.29.0 20080528 on mirror 0
[ 19.257067 ] agpgart-intel 0000.00.00.0: AGP 2.0 bridge
[ 19.257067 ] agpgart-intel 0000.00.00.0: putting AGP V2 device into 1x mode
[ 19.257130 ] pci 0000.01.00.0: putting AGP V2 device into 1x mode
[ 19.519863 ] [drm] Setting GART location based on new memory map
[ 19.519874 ] [drm] Loading R100 Microcode
[ 19.519931 ] [drm] writeback test succeeded in 2 usecs
[ 23.010053 ] ADDRCONF(NETDEV UP): eth0: Link is not ready
[ 23.011436 ] ADDRCONF(NETDEV UP): eth1: Link is not ready

Please help me.

Thanks, Naresh