Hi, yesterday I noticed that my iPhone 3G doesnt want to charge.That happened after i cleaned my home button with alcohol.But when phone turned off because of low battery i connected it to usb cable and it started charging.When it charged to about 10% phone turned on and it stopped charging again.Will opening and cleaning dock connector from dust help?I really wanna know what is the problem hardware or software.IPhone was running ios 4.2.1 , and was jailbroken.