Hello, I have a TX1000, whit the same problem, lights on and thats all, but, is working now, turn on always to the firts try and I change nothing, this is what I did, is was an accident but works
I disarmed completely the laptop
I Cleaned the dust and I removed the particuls of the fan and of the radiators of heat
I assembled the laptop
I turn on the laptop and I obtained the same result but now leave it turnd on like 2 hours with the lights on
I turn off it and I turn on it some 30 times, and suddenly the logo appeared of HP and started normally the system
But, I forgot to connect the fan and was heated a lot, but a lot of
I tuned off It and I connected the fan, can be seen for the cover of the memory
Then leave it to cold like an hour and since there has functioned well
My english is poor, I used a web translator
This it was my solution I am not responsabilite for wrong result, if work for you I will be happy, for now, I am happy with my laptop working again