You could check the guides, all the screws are reported with they size, then you can use a caliper to find out which one you need there. If you followed the "Display Assembly Replacement" guide ( iPhone 4 (GSM/AT&T) Screen Replacement ) you should have: 2 pentalobe screws 1x 2,5 mm (the guide says that sometimes are two) 1x 1,2 mm 1x 1,9 mm 3x 1,6 mm 1x 2,3 mm 2x 1,4 mm 1x 4,8 mm 2x 2,4 mm 1x 6,0 mm 4x 1,5 mm 6x 1,5 mm (large headed with washers) There are 23 screws (and 2 pentalobe). Hope this helps. G.
I'm not an expert, but I can say you that with my laptop I had the same problem, the DC jack was broken (I couldn't see the damage from outside) and I repaired it changing the jack. I don't know which problem you have, but maybe it is the same. ;) however check the power supply to be sure that the problem is in the consoles. Hope this will help. G.
I'm not an expert but I think the problem could be or in the connector or in the driver. Re-install the driver of your keyboard and then, if it doesn't work, try to find broken part in the connector (the number 3 in this image: http://laptoppartstore.weebly.com/upload... )