My G1 or HTC dream won't start up beyond the android logo. I have tried removing the battery and or the sim card.. It still does not start up. I tried hard and soft reset to no avail. After the android logo there is a backlight showing but nothing else. One more thing I can't seem to power off with the power button

open the pone and show the google account and enter sim show the network pin

http://forum.xda-developers.com/showthread.php?t=491350
above is a guide for returning your g1 back to stock
http://forum.xda-developers.com/showthread.php?t=668090
above here is everything you could ever want to know about rooting your g1

Hi i have htc g1 mobile and i have a problem with the start-up when I tried to turn on the mobile the first logo was T.Mobile G1 and than it turned on to the second logo androd.after those two logo a blank screen came and near the battery it came warm and on the screen nothing happens.

no u can not

u need to use someone else sim that has internet to make the account and then log in
when your done u can shut off the phone and put your card

Try spb backup is better and with a lot of options

So far, I suspect the G1, not the sim card. However, what type of phone was the other phone, and what issues did it have? did the other phone work with the card at all?

Have you tried a hard-reset - best to take out both battery and sim, leave them out for a few minutes before putting in again, then restart the phone.

Does it have enough power in the battery - suggest charging for a few hours and have another go? What colour is the status light?

Some phones do take a while to boot, did you give the phone plenty of time, eg, ten minutes, to be sure?

I've had a look at this manual:
http://member.america.htc.com/download/Web_materials/Manual/T-Mobile_G1/R1.0-Kila-UserGuide-Rev08-TMUS.pdf
but there's no support contact or troubleshooting info.

HTC support site is for "HTC Dream":
http://www.htc.com/au/faq_detail.aspx?p_id=187&act=faq&cat=0
There is a more comprehensive manual by HTC here, so you may find what you need. Possible you have blocked your SIM by operating it in the other phone without entering the correct PIN, so you may need to obtain an unblock key from your cellular provider to get going again. (see section 1.6 on p34 of the HTC Dream manual)

Other things to try, in case:

Do you use a microSD flash memory card as well, and if so, what happens if you have it in, and if you have it out?

Phones can usually be connected with USB to your computer, have you tried booting it while connected? Can the sync software recognise the phone at all?

Has anything changed with your cell provider, has your contract changed or expired? Assuming you had it working OK before?

Another question - if you have another sim card (a friend maybe?- if your friend is willing to lend you theirs) can you try that in the G1?

Please can you let me know what you have tried out of these, and what else you have tried?

At the very worst you may need to do a factory reset, which would completely erase any data and settings and start over. Only as a last resort. Here are instructions (HTC Dream):
http://www.htc.com/au/faqs.aspx?p_id=187&cat=86&id=108190&f=t
Not possible to do if you can't get into the menus though!

All I can think of for now, hope you can get it working.

sir my mobile is htc dream and my imei number is 352779030269263

how can ı copy my contacts from sim card to htc G1 android?

Maybe now there arent some programs you would expect on the G1, this is the first phone on a completely new OS. give it a few weeks when Devs have started introducing programs on the Android marketplace that allow the extra missing parts of the phones capabilities to be Filled in such as Video recording, Video playback, Bluetooth A2DP etc. Just remember, Android is Completely customisable, Absolutely anything can be performed on the OS with the right program and phone specifications !