[System] Why does my computer not suspend to RAM since installing a second hard drive?

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http://www.kubuntuforums.net – After adding a second HDD my computer, running Kubuntu 13.04, no longer suspends to RAM. As soon as the machine powers down it starts right back up again! If I disconnect the second HDD suspend works again. Here's the output of dmesg from the suspend to the unwanted resume: 1 [26759.388371] PM: Syncing filesystems ... done. 2 [26759.573752] Freezing user space processes ... (elapsed 0.01 seconds) done. 3 [26759.588178] Freezing remaining freezable tasks ... (elapsed 1.95 seconds) done. 4 [26761.540139] Suspending console(s) (use no_console_suspend to debug) 5 [26761.540532] (HowTos)