It will charge but after i take it off it wont turn on at all

Turn it off and plug it in to charge (do not turn it back on, it will turn on by itself).

y wont my mercury turn on it wont even showet chargeing how can i fix the problem.

The most common cause is a flat battery. There is a trick to charging the battery in these small mp3 players. It wont charge if it is turned on, and it won't charges if it's turned off. Here what to do...
1. plug the payer into your USB port. or wall charger
2. switch thje palyer on using the mechanical switch (on the side)
3. turn it off by either holding down the play button, or selecting "System" from the menu
4. The screen will go black and the battery will begin charging.

Try holding the power button while plugging it in. Also try holding the power button while wiggling a mini screwdriver in the reset hole

hey friend . .

this indicates that your battery is finished just go and buy new or
the battery need a repair . . . its charged is over . .

your psp is frying your battery. well the eeprom on the battery.

hey,
how about check your charger .. maybe there is a problem with your charger... try another nokia charger
Cheers

chek your charger port if good replace your battery

i happen to me you need to find a friend or a family that has the same phone that you have and that your problem solve!

my nokia 70 wont turn on