Hey everyone, I just replaced the front assembly on an iPhone 4 (GSM), and before the install I used a jumper to test the new LCD and everything worked great, but after the install it wouldn't power back on at all. I jumped the old LCD (not installed) and it powered back on and worked great again. So the phone works great as long and the LCD is loose and not installed. Also, I did clean the contacts with alcohol, and even tried another battery, but still nothing. Has anyone else ran into this problem yet?