T61 reacts to power button but stays silent

I recently dropped my Thinkpad T61 (model 6459). The laptop was off and in a padded bag, but apparently the fall was still sufficient to cause a problem. If it's at all relevant, it appears to have fallen such that the screen's top-left corner (if looking at the laptop while open) hit the bottom of the bag.
Now, when I push the power button, the battery and power-plug LED's below the display light up for about a second. The LED next to the two USB ports on the right also lights up. The fan does not spin up, the screen does not turn on, and the system makes no noise.
The system doesn't react to the power button for about five seconds after the LED's turn off. Pushing it after that just yields the same behavior: LED's on for one second.
If plugged in, the battery is charged and the LED's reflect the charging state.
I have tried reseating the DIMM.
Do these symptoms seem familiar to anyone? I understand the most likely culprit is the system board, but before I go hunting for one on eBay I'd like to see if there are more specific diagnostics I could do to narrow the problem.
Thanks.

You should probably take apart your laptop and then put it back again, to make sure all the connection hasn't came loose during the fall. Also try to reseat your CPU and fan/heat sink.
You could also try to reflow your motherboard as the last resort, there is video on the internet that teaches you how.
Here is the hardware manual that teaches you how.
http://www-307.ibm.com/pc/support/site.wss/MIGR-67980.html
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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T61 reacts to power button but stays silent

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