laptop shuts down when resuming from standby

Hello everyone, today I was trying to install FreeBSD 9 on my laptop, a Fujitsu LifeBook AH530.

From the live CD, I issued acpiconf -s 3; the laptop went into standby. Then I pressed the power button, and it started resuming; the CD-ROM made some noise, then suddenly the laptop went off.

What could have caused that behavior? How can I help debugging it?
 
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