or to save a bunch of steps just use odin to flash DJ05 in one shot
Odin -
http://dl.dropbox.com/u/458252/Odin%...in3 v1.3.exe
Stock 2.1- [ODIN] Full DI01 ODIN Package - xda-developers
Stock 2.1-DJ05
MEGAUPLOAD - The leading online storage and file delivery service
again im just trying to save you steps to find out if it is a hardware or software problem instead of flashing this and that just to find out it wont work anyway
Steps:
1. Pull battery from device
2. Open odin on desktop
3. Hold volume down button and plug device into computer
-This will place the device into download mode
4. Verify device shows up in odin
5. Click "PDA" button in odin (Never phone Area)
6. Select 2.1 file i just provided from where you downloaded it
7. Click "Start"
8. Enjoy your fixed /system partition!