G1/Dream running CM6 - black screen, won't boot, can't reset I have a T-Mobile G1/HTC Dream, rooted, running CM6.  It froze up at the lock screen, and after trying everything I popped the battery out and rebooted.  However, this didn't solve the problem; I still couldn't get past the lock screen.  After rebooting again (via battery removal, because nothing else worked), I only get a black screen (LCD on but blank).  The problem seems different than other questions here on the site because I don't ever see the T-Mobile splash screen.  I've tried Home+Power, Call+Menu+Power, Camera+Power, and none of those combos have allowed me to boot into recovery or factory reset, I still just see a black screen.  When I plug in USB, the computer does not see the SD card.

Update:  Now the LCD doesn't turn on either.  Perhaps this is a problem with the ribbon after all?  But that doesn't explain the freezing/booting issues.

Update:  Although I only get a black screen, the phone does vibrate when I turn it on (using any of the key combinations mentioned above).
Since you have CM6 flashed already, try booting the phone into the bootloader (fastboot). If you can get in there, you can rescue your phone with fastboot erase cache; If that doesn't work, reflash CM6. This will cost you your data that's not on the SD card.

Opinion: Having had a bunch of G1s (all secondhand), they are not the most reliable phones I've owned. I have had one turn into a brick (permanently!) after leaving it in a hot car (next to my Magic, same chipset, which survived) for 30 minutes.