Success!!
I completely took it apart again. Removed the display assembly (but not separating this), mother board and sync connector. Cleaning everything by blowing clean, compressed air (from a aerosol can) in every nook and cranny and trying to get air in between the mother board and the RF sheilding from all directions, blowing everywhere on the back case and on and around the buttons (that where still in the case) and on all connectors (both on the mother board and on the flex cables).
Then assembled everything again, making 100% sure that all the connectors where correctly seated. Turn it back on and loo and behold! Everything works like a charm!! I can turn it on and off, I can enter DFU mode and it doesn't reboot as soon as I unplug the sync cable!! Dang, I'm a happy camper now!! :D
PS. Just in case this haden't worked, my next attemt would have been to spray/use some 'electronic cleaning solvent'.
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I had faced the same problem and I have switched off my iPhone by pressing home button along with on/off button and I worked fine
crwdns2934271:0crwdnd2934271:0 PMS Quiz2015 crwdne2934271:0
My restart and off button wouldn’t work
crwdns2934271:0crwdnd2934271:0 Abe crwdne2934271:0
Excellent Advice ! Never would have thought of this solution in a million years ! Thank You very Much for your Help ! antioklan !
crwdns2934271:0crwdnd2934271:0 Martin Svika crwdne2934271:0