Samsung GT-i9000 Galaxy S hard reset with buttons
(I tried and it works) ClockWorkMod recovery i9000の (in short: Vol UP + HOME + power ON i9000)
If not workingのcharge your battery fully before doing a hard reset! (and Backup :) )
PRESS AND HOLDの VOLUME UP + Home Button (or VOLUME UP + DOWN)
Keep pressing these 2 buttons + press Power button for の2-3 Seconds
Release only power のbutton, but KEEP pressingの Volume up + Home Buttons (or VOL UP + DOWN)
With Volume down select wipeの data/factory reset (3rd) > Press Power (or HOME)
Some say in US hardware/phone withの EU firnmware version has changed VOLUME UP to VOLUME DOWN key. Try that trick too and leave comment below.
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i9000 unlock forgotten lock pattern
(VOLUME UP + HOME + POWER buttons) のor (VOL UP + DOWN + POWER)