Try booting with the reboot=h command line option, and see if that resolves things. If it does, please attach the output of "sudo dmidecode > dmi.txt".
** Changed in: linux-source-2.6.15 (Ubuntu)
Status: Unconfirmed => Needs Info
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after sleep+resume I can't restart the system
https://launchpad.net/malone/bugs/29695