Palm treo 650 wont power up

Treo 650 will not power on at all even when charging. Please help

It may be past the point of turning on.
If this is the case, if you connect it through the USB cable to your computer for a little while, it can get a small charge.

Trickle charging
Some Palm devices have the ability to "trickle charge" from a USB port on a PC or Mac. This means that it receives a very small amount of charging from the USB port, even if it is not connected to its AC charger. If your device is capable of this function, the charging time will be significantly longer for a trickle charge (depending on the power rating of the PC USB port). However, the device may not charge at all on an unpowered USB hub (or for example off off a keyboard).

If you can then power it on afterwards, connect it to the regular power charger.