Stuck at the dreaded rainbow screen

[Shadax]

I've googled the crap out of this problem and even downloaded a DREAIMG.nbh file that seemed to have ran through and got OK on everything but it still boots at a rainbow screen with
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DREA100 PVT 32B
HBOOT-0.95.0000
CPLD-4
RADIO-1.22.12.29



Serial0
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Did I use the wrong file? I've never used a G1 before, it was handed to me by a coworker with hopes I could fix this.

Thanks for any help.

Edit:

Just press Call, End Call and MENU at the same time.

Tried this, no dice.

I just discovered that when your G1 get stuck on the Rainbow Reboot screen all you need to do is:

1) Pull battery out so phone turns off; then put battery back in
2) When phone is off; you need to Press and Hold down the "Power" (red) & "Home" keys at the same time so it takes you to the reboot screen.
3) This will take you to the the warning Icon
4) Press and Hold down the Power and Home keys again and before selecting the reboot option
5) PLUG YOU PHONE TO A COMPUTER USB CHARGER
6) then Select reboot option
7) This should power up by taking you to the G1 loading screen first, instead of the straight to rainbow screen.

Now instead of going to the rainbow screen like it kept on doing, the phone should just powers up. The first time the phone kept on getting stuck on the rainbow screen, I had to wipe the whole phone then and do the steps above but this way I didn't loose any of my info or apps!

This worked for me so I hope it does the same for you!

-KushVision

Tried this, got stuck with a triangle and "!" screen with black background.

Edit x2: Alt+L brings me:
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Can't open /cache/recovery/command

Home+Back - reboot system now
Alt+L - toggle log text display
Alt+S - Apply sdcard:update.zip
Alt+W - Wipe data/factory reset
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I did the factory reset and tried the reboot. Back to rainbow screen with serial0...

Thanks again.

Editx3: Alas, it seems the phone is bricked if the information at the bottom of this thread is correct - http://androidforums.com/g1-support/171494-rainbow-screen-sigh-need-major-help.html