Originally Posted by pinoy_android

I got my phone replaced by the store but there is tutorial where it says the phone can be forced to download mode via connecting three 100k ohm resistors connected in series. The ends of the resistors should touch pins 3 and 5 of the USB connector. The two pins nearest the headphone jack.

I did not get to try it... I mistakenly bought 100 ohm resistors instead of 100k ohms.
here is a youtube link. Samsung Galaxy S (How-To Unbrick *USB JIG Method*) - YouTube

hope this helps!