Yeah, I know--I shoulda had it fixed. I decided to risk it because I'll be getting an iPhone 5 when it comes out and can do with a loaner POS till then. And, I wanted to advance in dweebhood by gaining a little practical experience at this. And yeah, I'm a twit. Granted. For now, I would greatly appreciate advice on what to do. Let me spell out all the details so you can see where I stand. Story: I cracked my iPhone 4 from glass panel. Got a replacement part, took iPhone apart, tried to fit screen on...and discovered it was the screen for an iPhone 4*S*. Didn't know the difference (top corner screw brackets the giveaway) and error was seller's; order page, invoice, and box were marked "4" and not 4S. So I had to wait 2 days with a disassembled iPhone (covered or bagged parts while waiting), got the right part from another seller (got a refund for the wrong one), and put the phone back together. I don't think the wait affected anything, but felt I should mention it anyway. It worked. Screen OK. Reception fine. All parts functioned. For the rest of the day. I plugged it in to recharge overnight (relevant?). The next morning, the screen showed black. Touchscreen worked, I could use it blind, but no pixels showed up. When turned on, the backlight (?) turned on, you could see slightly lighter shade of black, but no picture. After evaluation, I considered a few things that went wrong in the initial repair. #1: Front glass was not flush with case. Found this out only after it was reassembled. Slight backlight light leak visible from side. #2: As there were no instructions, as no tutorials mentioned this, and as I am (as noted) a twit, I did not remove the blue plastic backing from the new LCD part, the one with the little tab at the bottom right. I was wondering why it was blue and not silver, but thought it was a maker variant and did not want to remove something that might be necessary. It might have contributed to #1 on this list. When I disassembled, it came off partially as it stuck to the frame a bit. Also, a bit of black rubber from the bottom of the LCD came off with it. I assumed that was not vital, but maybe that was what caused the touchscreen to fail? I have no idea. Alternately, maybe the extended pressure from the plastic backing wore at the screen and trashed it by morning. #3: Small rubber part dropped off, had no idea from where. Looked like it would have been impossible to track down, so I left it out (remember, I *know* I'm a twit). Turns out it was from top of motherboard. I suspect this may have fried my LCD cables, as, assembled, this part is between the edge of the motherboard and the LCD cables. (Web sites I found later claim it is to improve reception). #4: Motherboard did not fit back in 100% properly. When reassembling, the two small hooks on the EMI shield with the 5 screws did not latch in right. The outside one did, that is, but the middle one would not reach. I probably was stupid to let it go like that, so consider myself (on this as well as on the other frack-ups) self-chastised. Other possible factors: the vertical LCD tab was stiff and hard to hold down and the first time I tried, I had the devil's own time trying to get it into place. I did not see any physical damage, but wonder if pressure while placing it wrong trying to plug it in may be a culprit. I doubt it, though, as it worked for several hours after the initial repair. I think that's it. So, I took it apart and re-assembled it, aiming to fix the snafus. After the second repair, I had (1) made sure the glass was flush with the case; (2) took off the blue plastic backing from the LCD; (3) reattached the rubber bit on the MB; and (4) made sure the EMI shield fit perfectly. Everything went back in exactly as it should have, as far as I could tell. I started it up, and... almost the same as before. Black screen with slight brightening of backlight--but this time, the touch screen didn't work, either. My own guess is that either problem #1 (the rubber from the MB) or #2 (not removing the blue plastic backing from the LCD) are the most likely culprits. On the other hand, I can confirm that the phone seems to operate: I can receive calls (I just can't answer them), meaning that the iPhone, apparently, is functional aside from the screen. Meaning that possibly it's just a matter of getting another LCD screen. ----- That's where I am now. I am not hip on getting an official repair, too expensive where I am (Tokyo), especially for the few months left before a new phone comes out. So, my options are: #1: disassemble and try to reassemble again, hoping that there is still something that can be fixed (i.e., pipe dream scenario) #2: assuming the problem is only with the screen, order new LCD screen, repair again (i.e., risky but practical) #3: try #1, rinse and repeat if for no other reason than for practice, and when nothing works, get a cheapo POS loaner replacement from my carrier and wait for iPhone 5. #4: something I have not thought of. Any advice is appreciated, just so as you know that I already am aware that I'm an overconfident twit for trying my hand at DIY in the first place. Thanks!!!