What could be wrong with my G1?

Alright, I baught my G1 from a friend off Craigslist and I got it unlocked so I could use my g1 with AT&T. The phone was great for a few weeks. Now it just randomly turns off, it sometimes restarts but most of the time I have to take the battery out and put it back in.

I did a google search about it and read a few things but their situation isn't exactly like mine.

When it turns off and stays off (wont respond to On Button) there is a red light near the speaker that is just constantly on and wont turn off, even when the phone is unresponsive.

I use a generic USB plug to charge my G1 from my PC.

My phone has root abilitys but I had this problem before I enabled root.

Does this on all versions RC29 to the Current Cupcake

Do I need to send the phone to HTC?
Do I need to get a new Battery?
Can I buy the battery retail or from only HTC?
Will HTC service my phone even though I got it off CL?
This phone was purchased around Sept last year (when the owner orginally had it)


Phone turned off again, started with the T-Mobile logo. I shut the slider so its closed and it turned off. Will not turn back on.

I tried a little bit close to 30 times now and no response.

Thank you in advanced for the help and replies.

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rooting your phone ruins your warrenty so sending it to htc wont work

Your problem is within the first sentence: "Alright, I baught my G1 from a friend off Craigslist"

That's all I'm saying.

i have the same problems too....