Hello, The infamously known "Serial Number" issue attacks me at my weakest point. i'm going to try to make this as clear as possible. Mac Specs: Model: MacBook Pro 5,2 (unibody) 2.8GHz Intel Core 2 Duo 4GB RAM DDR3 Mac History: No Logic Board has been changed before, Its the same one. Hard Disk Crashed twice and went to recovery, then replaced by a new hard disk New HDD: TOSHIBA MK5059GSX (~500GB) Recently Setup Mac OS X Mountain Lion Note: I don't think this is related to the OS. The reason i identified this problem was due to iCloud not working, It never worked on Lion previously either. After Setting up Mountain Lion (thinking that this will fix all my problems), I was stalled again with iCloud, Facetime and such apps to continue NOT working. Hence my extensive research on this topic till i summed it down to the Serial Number Probelm Story: Through Terminal: typed: "ioreg -l | grep IOPlatformSerialNumber" Gives Me: "IOPlatformSerialNumber" = "System Serial#" Apple Menu > About this Mac > Double Click On Version Details Gives me: Serial Number System Serial# System Profiler Application Gives me: Serial Number (system): Not Available The Lizard App couldn't find SMBIOS.plist I know where my Serial Number is Etched on the back of my laptop Tried PRAM and SMC Resets. Inquiry: While keeping in mind that i currently have no reach to any apple store, retailer or reseller and my only way to fix this problem is a DIY task that i'm hoping to gain from you guys, I need to be able to reinstate my Serial Number (or flash logic board). Apparently there are tools that can do that, which i can't seem to get my hands on (other than lizard, which didn't work for me). So, How do i get my mac to recognize my supposed serial number to have it back to normal? Thank you in advance.