The screen just flashes palm powered. will not respond to anytype of reset or battery unplug.

http://forums.palm.com/t5/Support-Downloads/Palm-Centro-ROM-Update-for-Freezing-Issue/td-p/165101

did u try a different battery?

Have you tried doing a soft reset? To do a soft reset, use the tip of the stylus to gently press the reset button inside the hole on the back panel of your handheld.

you should have selected yes. Now do a hard reset, reset your phone to factory settings.

You need to perform full reset which will erase all personal data and set everything to factory default. You need to press reset and power button to perform full reset.It will give you confirmation once you choose yes it will perform hard reset If issue persist you may disconnect and reconnect to internal battery

Do a reset. You will lose all items on you device.
Take battery out. Put it in and hold the power button on till you see the palm logo the second time. Release when you see the 2nd logo. It will prompt you for pressing up to delete and reset. Press Up. It will take some time to reset and reformat but please wait. 
After that your phone should come to the setup screen. I would hotsync after you setup to get your contacts  back.

There are multiple reasons for the phone to go into an endless loop.

Fix #1 - Soft Reset - Take out the battery. On the back of your phone, pop the cover off, remove battery, place battery back in and it will show each screen once and power on normally.

Fix #2 - Hard Reset - To do a hard reset, hold the power button while you replace the battery and then release it when the Palm logo appears.

Fix #3 - Hammer

You can take the back off and unplug the battery for a few mins, this sometimes will clear a logic lock

The top plastic digitizer is defective.

It needs to be replaced.

There are several sources on-line to buy such digitizer part.

Best regards,

Well watch this video and after you follow the directions get the screen and find the glass like cover and remove it from the screen bend it in a very lightly way, then put it back on and put the PDA back together and BAM.