Mine has already twice made the same thing. Solution was simple - got the touchscreen changed (luckily under warranty). As third problem required change of the motherboard, I'm planning to get rid of the piece of junk alltogether. I think it is a solution for all the troubles with tx1000.
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Most of your hardware on that computer will be have been made after Windows XP was released. Therefore the manufacture may not have any drivers for XP. I know HP will not list any. Best bet Put Windows 7 back on the computer. Go to hardware manager and write down every piece of hardware (brand/model). The try to go back to XP and go the individual hardware brands websites and look for XP drives. The problem at this point is you are most likely seeing a big yellow ? listed in device manager in XP, so you have no clue as to who made the individual piece of hardware. Also I am not sure that XP will support the touch screen. .
These TX1000's have their fair share of issues, and this one is the most costly (potentially) to resolve.
There are two, and only two, possibilities for why the digitizer in the LCD isnt working.
1) On many occasions, I'd estimate about 40% of the time, there's a little cable inside the LCD housing and behind the LCD itself that connects to a daughter-board, which then is cabled to the mainboard. This little cable sometimes comes loose, and a simple reconnect will resolve the stylus pen issues.
2) The digitizer in the LCD has failed, no separate LCD+digitizer purchase, oh no no no....Gotta get the whole damn assembly. Part# 441106-001 at roughly $550 exchange from HP.
I have the solution to the touch screen problem. You need to get the support and strip down document for yout touch screen from HP.. for instance the one for the tx1000 series is c00853874.pdf
you will need another machine or to print the pages required to strip your machine all the way down to removing the monitor, and the surround on the screen.
the document is step by step...label the screw etc, you'll be fine...even if you have never done it before.
the result is the terrible build quality of the machines. the ribbon access cables for the webcam, and for the touch screen are poorly installed.
I found that my touchs screen access cable was not actually properly installed at all, and was only barely contacting when i received the machine.
my touch screen is working properly, you need to be gently with everything, the circuit board that the webcam and the touch screen connect to is directly behind the screen..
you must strip the screen down, and then lift the glass... there are 4 screws around the edges of the glass when you have it stripped down... once you lift the screen up.. there is a circuit board on the rear of the top of the plastic screen back. the are connectors going into this...for the quick access buttons around the screen edges...the webcam,.. and the touchscreen.
i have to say i just discussed this with a guy called GINO on Hp online support...and he doesnt care that this is the solution...or that there has been a manufacturing fault since day on.. they never plugged the cables in properly.