T61 Battery light flashes red and green

Hello:
My T61(type 8891) won't start. I'm getting a series of flashes from the battery and power lights:
A/C power connected: power light flashes green alternately and battery light flashes green then red/green.
AC off, battery installed: power light flashes green at the same time as the battery light flashes red/green.
This happened twice before in the past 2 weeks. After about an hour, it booted up - no problem. This time, nothing.
Thanks in advance for any assistance.

It started about one month ago - no known cause. The problem happened 3 times since then but each time it booted up by itself after a half hour or so. A new motherboard is going to set me back plenty but f it's needed, I guess I must get it repaired. I'm quite handy at taking the laptop apart. I've replaced the hinge, and bezel.
Maybe the fan is inoperable which may cause it to not boot up. Lately, I've been feeling exhaust air much warmer than before even if it's not being used. I blew the dust off it 3 weeks ago.

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