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Thanks for the heads up on the on this other thread that started Porto-Filho 
Not to add extra garbage, but ill share my similar problem post as well, in hope that it can help some else out with a similar problem in the future...or us ;(
"Compaq Presario 6150b wont boot - no BIOS screen - powers on and off repeatedly"
http://h30434.www3.hp.com/psg/board/message?board.
Funny so far my post was viewed about 50 times, and still no response...
Any of you guys got a warranty?? If so please let me know and if you get it fixed...i dont got a warranty for mine and i know im gonna get bent over good on this one if i cant do it myself... 
.. but I will try.. the problem is with hp's project.. there is a chip (BGA (Ball Grid Array)) that controls some of the peripherals (videos, wireless...) and this chip uses the same heatsink as the processor, the problem is that the heatsink is about 3 CM far, and HP uses a kind of "thermal tape", but apparently it is not enough and the chip lose its solder (?) causing a bad contact (that's why some related that at the beginning the computers sometimes starts (I said that ), or weird ways to press the power button .. That's it.. i hope you understand and i hope you are eligible for the free repair.. I will have to pay about $200 to have it soldered (reballing) and with its own heatsink.
I would be careful saying that "we all have the very same problem" and linking to that support article. I don't disagree that the article may address the problem you have with your PC, but this thread is about the TX model, which is the same model PC that I have. The article is very specific about which models are addressed by the fix and the TX models are not impacted by that issue nor are they eligible for the service enhancement described - read all the way through the article to the FAQ section and it clarifies the models that fall into this category.
Also the symptoms don't exactly match the issue I had with my TX model anyway. My fan runs fine when I boot up even though it is in sleep/hibernate. The notebook does get power because I can plug and unplug the AC adapter when the PC is in sleep/hibernate and both power LEDs change corresponding to whether I unplugged the adapter or plugged it back in. I was surprised when I finally woke my PC up because the AC was actually charging my battery if I had the PC 'booted' up but it was asleep. And as I indicated in my previous message listing the symptoms I ran into, there is no beep code from the PC at all. That was one of my gripes because a beep code will at least give you a clue about the problem.
I'm sure the issue you posted with the link to the article is the root cause of some similar issues on other models listed but it doesn't apply to the TX. I can also reproduce my problem by manually putting the PC into sleep or hibernate. Same exact symptoms as before and the same step I described earlier has worked on each repro.
There seems to be several similar but unrelated issues and fixes - on various PC models. I don't want to discourage anyone from checking support articles and obviously the issue in that article is impacting a lot of users. But - at least for my PC problem and resolution - the suggestion I posted earlier did work for my TX and I can repro it over and over again. If anyone has one of the PC models listed in the article in the previous post from Porto_Filho with the same issue described, follow those steps and get the free repair.
Sorry Porto, not trying to be argumentative but the first sentence in your post might send some people down the wrong path if they have a TX - and it sounds like HP wouldn't be able to help TX users anyway if that issue is only impacting specific models and isn't a class problem with any Pavilion.
Thanks for your post too because one of my friends called me earlier with one of the models listed and your help with this is going to resolve the issue he is having.
