System doesn't resume from hibernate instead boot normally

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http://www.backtrack-linux.org – Hi, Initially hibernate/resume was working fine. But now system hibernate but doesn't resume, instead it boot-up normally. I had checked SWAP is mounted on /dev/sda2 I have tried hibernate from [menu] -> Leave -> Save to disk There is no problem in hibernate process, but resume fails. I have also installed uswsusp package and tried to hibernate through command "s2disk", again it hibernate properly but fail to resume. Is there any thing to check? (HowTos)