Computer Keeps Freezing When Starting

I have a Dell Inspiron N7070 icore 5 laptop (17" screen) that I've had for about 10 months. Within the last 2-3 weeks, the computer started having problems starting. At first it happened a couple of times but after kicking into Startup repair (which itself never has repaired the issue) and shutting it down via on/off button, it would eventually come back up. Then it just froze and wouldn't start at all in my home environment. My brother works in IT for an organization and I asked him to take a look at it which he did. He first restored it to it's original state through the Dell Backup program at his house but when I brought it back to my house it immediately froze in the same way (the process starts but just gets hung up). I had an older router (G series) and he suspected that the problem might be related to that but when I got a new router (n series) the same thing happened when he repeated a restore process and brought it back to my house. It did actually reach the user choices a couple times but froze from there when trying to connect to the wireless system. Next he restored it again but this time used a restore image program (Acronis True Image 2012)and once again it worked perfectly at his place. We first took it to a different environment (Panera) to try to do a wireless connect but it got hung up there before it could connect. We did another restore image via Acronis and it worked fine in the Panera.However, when I took it home immediately afterward, it once again got hung up after starting and I had to do another restore image with the Acronis and it worked like a charm after that. When I turned it on this morning, it froze once again while starting and I once again proceeded to do another restore image with the Acronis program and it worked fine. What is going on here....why does it keep freezing in different environment or after certain durations of time? Is there some problem with Windows 7 when it initially tries to connect or is it something else perhaps corruption in the drivers? I also should state that we ran Malware Bytes and it was clean after it was restored. In addition, I should also mention that almost from the beginning this laptop had a tendency to freeze at certain times usually if left unattended for awhile (while still on) or when put in sleep or hibernation mode but until recently (as stated above) it never froze when starting up. Could there be a connection between all these glitches noticed from the start?