Sounds like something is loose, if the machine is under warranty call the manufactor.
With a laptop you shouldn't have this issue.
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P4 1.8A @ 2.3GHz, 40C, Abit TH711, 512mb PC800 RDRAM, 60g WD, Lite-On 16x DVD, Gforce4 TI 4400, SB Live 5.1, 431w PS
Dual P3 1000, 1g PC 133, 550w PS, Adaptec SCSI,18g,36g Cheetahs