T61p won't turn on - blinking AC Power, orange Battery and U

[twr7cx]

My T61p won't boot up. It's just sitting there with the AC Power light, orange Battery light (The battery light looks like it is being illuminated by both the green and orange LED at the same time) and Ultra Slim status light illuminated and they are blinking (so quickly turning off and then on - on for a second then off for a fraction of a second, etc.).
Even with the battery removed the orange battery light is on, and even with the charger disconnected the AC Power light is on.
I removed the keyboard and disconnected the motherboard backup battery, when doing so I noticed that the heatsink for the CPU etc. is slightly warm to the touch (not hot, but the CPU is obviously doing something as it's slightly warm).
When I disconnect the motherboard battery and try to start the unit, the same 3 lights flash, but now at a much slower pace and flash 4 times only. If I push the power button again they then continuously flash at a slower pace.
Any ideas?

[Harryc]

Intel Core 2 Extreme X9000 2.80GHz Mobile Processor

Is this an upgrade that you did yourself? Do you have the original CPU? I'd try the original if you have it. I'd also try a different AC adapter based on your description of the symptoms.

[twr7cx]

Intel Core 2 Extreme X9000 2.80GHz Mobile Processor

Is this an upgrade that you did yourself? Do you have the original CPU? I'd try the original if you have it. I'd also try a different AC adapter based on your description of the symptoms.

The original CPU is in my R61e. The X9000 has been in and running for many months now flawlessly.
I've got a spare AC adapter will try it.

[twr7cx]

Spoke to Lenovo this morning and they've got no idea, suspect the system board is faulty, but they can't confirm until they receive it. So it's going back under warranty (very glad to have gotten the 3 year extended warranty now).

[sktn77a]

I would remove the X9000 CPU before sending it back - there are some motherboard tolerance issues with the T61p mobo and I don't think that juiced-sucking CPU is going to help!. If they see that CPU in there, I don't think they'll honor the warranty. While you've got the old CPU back in there, I'd also pull the turbo memory and see if it will boot up.