Overheating...but only on standby, lid closed!

Many threads on overheating...However, my problem is that my MBP doesn't overheat when operating normally, but only when on standby, that is, with the lid closed and that little glowing light pulsating. It's a problem because I'm affraid of leaving it on standby and carrying it around. The last time I left it on standby in my case, I was alerted by the fan noise - the MBP was boiling! Same thing whan it was on standby on the table, thus without a ventilation problem (like it would be in a case). Instead, I have to turn it off, I just don't trust it on standby! Anyone with that problem? And any suggestions?...
A.

Based on your description, I recommend that you contact Apple and advise them of the symptom. The condition may be the result of a defective battery or logic board. That said; you could perform a Power Management Reset and/or Repair Permissions to rule out something more basic.
Repairing Permissions and/or Resetting the Power Management Unit (PMU) is known to resolve certain anomalies or conditions, and may help with your symptom. Neither process will compromise or harm anything with your Mac so it’s worth a shot.
Repair Permissions:
Go to: Applications/Utilities/Disk Utility
Select: your Hard Drive
Select: the First Aid tab
Select: Repair Permissions
Resetting the Power Management Unit (PMU)
If the computer is on, turn it off.
Disconnect the AC Adapter and remove the computer's battery.
Press and hold down the power button for 5 seconds and then release the button.
Reconnect the battery and AC Adapter.
Press the Power button to restart the computer.
Ref:
PMU: http://docs.info.apple.com/article.html?artnum=303319
User's Guide: page-95
Regards,
MBP-15"/2.16/7200/W8612...   Mac OS X (10.4.7)   G4 Tower (OS 9/10), Dell 620 WorkStation (XP Pro), Gateway P4 (XP Home)

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