I turned on my laptop (almost 3.5 years old, Dell Inspiron 1525) and it said "internal hard disk not found." I let it run the tests and still did not start up. After a while, I tried again and the laptop turned back on to normal function. I checked the BIOs when the computer wasn't starting up and there was no primary hard drive detected.
What's the problem? Is it the hard drive? Motherboard?
I'm very careful with my laptop, it's always at home and I don't bring it to school or work.