Laptop booting problem

[Mohan8012]

I gave my laptop to service center for keyboard problem. They replaced it with new and returned to me. It was worked well before shutdown. Then when I restarted, it is not booting. And it is not entering to Bios also. Without hard disk, it is entering in to bios. then I checked the hard disk with another laptop. it is booting well. Then I used another laptop's hard disk in my laptop. it is booting well. But my hard disk not booting with my laptop. Pls help to come out of this.

 

[WyomingKnott]

Take it back to the people who broke it?

 

[Mohan8012]

Which one(broken) you are suspecting..?

 

[WyomingKnott]

Sorry I wasn't clear. If it worked before you put the machine in for keyboard repair, and it fails after the machine was returned with the repaired keyboard, the first suspect is the folks who did the repair. At least, that's the first thing that pops into my mind.