"powering through usb-dc adapter cable"
how are you connecting the usb-dc adapter cable? Is the power led lit?
if you are connecting the adapter to the DC jack it will not work. The voltage regulator needs at last 7volts.
But you can connect the adapter directly to the +5v. pin and to gnd pin on Arduino.
if you're using the parallel port programmer (http://www.arduino.cc/en/Hacking/ParallelProgrammer
I think you need to install giveio before. You'll find this link (http://web.mit.edu/6.115/www/miscfiles/giveio.zip
) at the end of the parallel port programer page.
If you're using WindowsXP, this would be necessary:http://www.melabs.com/downloads/XP_stop_polling.reg
More info here: http://www.arduino.cc/en/Hacking/Bootloader
if you want to upload sketches without using the bootloader, be sure the changes you've made on preferences.txt file was correct. Your post says:
and the correct is:
If your Atmega IC was empty (i.e. you never burned the bootloader on it), you must change the fuses on it to make it work fine. If you're not an expert, I think the easiest way to do it is burning the bootloader. But you can use the IDE0011 bootloader, with the parallel port programmer.
You must select the board type on IDE: tools/board/arduino NG or older w/ atmega8
Then, select tools/burn bootloader/w/ parallel programmer.
Before burned the bootloader, you can upload sketches through serial cable (using the bootloader - remember to change upload.using=bootloader on preferences.txt) or upload sketches using the parallel port programmer (not using the bootloader already recorded on it - remember to change the upload.using=parallel on preferences.txt)