Help pleeeease with my g1!

[berryblack]

Hello people.

Ive just bought a G1 from computer exchange in London but all is not going well. It takes about 5-10 mins to start up and when it does it does nothing apart from making calls.

When its loading it says "T-mobile G1" then goes on to say "HTC HERO by tehseano and moonsspoon".
when its finally done i can do nothing with the phone apart from make calls. i even press the menu button and noting comes up! oh and when i drag the page down it says "t-mobile notifications".

Is there anyway i can get it back to the original t-mobile setup?

Thanks

[berryblack]

sorry i forgot to ask.
how do i know if the phone is rooted and if it is how do i know what software i am using?

[fone-tech2009]

hi
hero?

reset
turn off phone . then hold camera button while pressing the power button when finished on rainbow screen remove battery and replace. reboot.

if this fails.
turn phone off then hold down home and back button and press power button at the same time.then follow onscreen instructions