My htc g1 switches off and does not start untill i plug it in my computer even if the batery is charged please help me

you need new battery you can get them cheap on ebay

Most probably there is a lose contact which heats up and deforms during usage, or can be deformed with the slightest pressure in your hands - therefore it can be switched on only when it either cools down and your press it in some particular way. Or both simultaneously.
This problem will never fix itself - ff you really want to use your phone and trust that it will work, you should ask a repairman to fix it.
Is the warranty period still lasting? Then you should ship it back to the dealer/manufacturer. First you will be required to cover the shipping costs, but you should arrange that they refund these costs if they find out that the problem with phone was not your fault. That's because consumer law in any civilized country states that the seller shall cover all expenses related to warranty service repair if it wasn't your fault, but you should cover all costs if the problem was caused by you.
If the nearest HTC warranty service is far away, and you don't want to spend long time to have it fixed - then it might be more useful to find a repairman in your proximity (unofficial repair services are usually quite cheap).

Hi

The battery need to be replace. It is already weak.

Get the original battery from HTC company and charge for six hour.

Thanks

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.

did you FULLY charge it the first tim eout of the box before using it? They say if you dont do that, the battery will never fully charge... def a bad battery tho!!!!

hello, seems like awhile ago but i hope i can help still.. no software is required to manage your sd card on the g1. what you need to do is plug the g1 to the computer using the usb cable. then when that happens you should get a notification on the top of the g1 screen saying usb connected. then you put your finger on the notification tab and drag it down. click on the option in the notification screen. then select to mount to access your g1. then on you computer you should get a screen asking how you want to view files. if that doent work go to my computer and you should see removabe disk and thats your phone.

Have you tried recalibrating the battery? To do this you use the phone until it completely runs out of battery and switches itself off. Make sure it has completely run out by continuing to turn it back on until nothing happens except a red LED coming on. Then charge it while it's off until the green LED has been on for 2 hours. Hopefully this will improve your battery life.

Had a similar problem on my HTC (same maker of the g1) touch diamond, the charge light/indicator would stay on even after i took the cable out.

It could be just lag. Try doing a soft reset, where ever the reset button is on the G1 (Inside the back case?) If that doesn't help do a hard reset which deletes all data/settings (other than your carriers settings, your phone will still work), you would have to look in your manual, as I dont have a G1.

Well, the G1 is a smartphone and it's constantly on the internet so it's obviously going to use a lot more battery power. However 3 hours is ridiculously short! You could try recalibrating the battery. To do this you use your phone until it has completely run out of charge and switches itself off. Then you turn it on again and again until all that it shows is a red LED and it refuses to turn on. After this you charge it while it's off until the green LED has been on for 2 hours. Hopefully this will help improve your battery life.

take the batteries out and put it back in again and try charging check in diff power sockets press the end of the charging cables with little amount of pressure and have a check try to connect via the usb cable to the computer and check if it charges, if works the charger is faulty if still did not work then it will be firmware problem with of phone