It could be digitizer, charge controlling IC, sweaty palms, wet screen, dirty screen and any combination of these and more.

Digitizer is RM300.
Mine has the problem when using certain chargers.

Even the original charger has problems.

Personally I won't bother changing.

Better phones can be bought for less hassle. The milestone, even though is good for using as a GPS device is getting a bit old technology wise.

You just got the phone ar? And yes I know who is Mr. Lai, bought from him before also.

If not mistaken your problem related to hardware started to failing. And yeah, repairing it almost the same price as buying another set.
your problem is not hardware failing issue. It is cause by the incompatible charger.

Lucky you, able to sell the phone. What phone are you planing to buy? My recommendation would be to have 1 gigahertz phone at least. RAM should have at least 512 megabytes.

thanks for reply 

can the ghost screen problem be remedied with flashing with new ROM?

Has anyone had this problem? Is there a fix? 
The past few days the phone was acting up..As if a ghost was thumbing thru the phone????!!!!
It's like an invisible person is playing with the functions and touch screen......
I swipe the lock off and the phone just goes off on it's own,I can't control the thing......
Dialing numbers,browsing the web,enters my settings,changing settings....
CRAZY!!!!!!!!!!!!!
I went as far as to do a master reset of the phone and it still continues. On and on.....
Every so often,and not so often I can regain control,but it just goes back to phantom mode.
When I reset it I took the sd card out as well and restarted without the card in and got the same results............GHOSTS......PHANTOMS.
I'm ready to throw the phone at the wall.....
Has this happened to anyone??????
Can it be fixed???  

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Added on April 5, 2012, 3:06 am
Sumore some button cannot used

buy online, but u must have some knowledge on how to open it

second option: get a new phone, droid 2 global / milestone 2 if u want a slide keyboard (no ICS update, only custome ROM based on ICS)

pm me if u wanna but D2G cos im willing to sell it

I got mine at http://www.tmart.com/ for a very reasonable price and I DIYed. Not sure about the repair counters, I did not bother but I'm sure they can. I did it myself anyway.

Note: Tmart gives a free Supplied screwdriver that is t6, you need a t5. You also need a small Philips.
Note: not easy to be done, need to be patient and carefull. Bloody cables and connectors everywhere as the touchscreen has to be accesed from the back, meaning everything has to be taken apart.

So far after a week, phone working great.