screen resolution drops down to 640 * 480 after monitor change

[Kamal Paryani]

hi

after installation if i change my monitor on ubuntu 7.04
it does not take the resolution higher than 640 * 480
but the monitor is capable of higher resolutions

if i switch back to the original monitor on which the installation was done
then it allows me to increase the resolution

please help , how do i tell ubuntu desktop to ignore the monitor

regards
kamal
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