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to re-set alarm?

I have changed the battery in the control panel of 9800 alarm system, hidden underneath the stair case, but cannot re-set the system for some reason. Is it because I have not shut the cover to the panel when changing the battery? please advise.
Sayed, July 2012
no prob e manno,valid assumtion

gts, July 2012
Sorry gts ,me was thinking this guy had left the cover off ?,

Yes answer gts Sayed :)

e manno, July 2012
Refit the cover and try again,

The system thinks it's been tampered with if the cover has been left off, clever things alarms.

e manno, July 2012
what does the keypad say

gts, July 2012
link Click here to see other fixes for DSC 9800.