Any number of things. If it doesnt start AT ALL, you could have a bad power supply, your motherboard may be fried, (power surges, magnetism can do this, your hard drive may be correct. Unfortunately, there's really no way to know until you start replacing parts and seeing what works and what doesn't. To save frustration go to Best Buy or something and pay for a diagnostic to see what's going on.
Five possible reasons: Virus Hardware Failure Possible hardware change Software Problem (have you installed any new applications) Vandilism
Check the fuel pressure. Check the computer codes for possible sensor issues. It is possible that a sensor is sending wrong info to the computer.
The booting of a computer is the re-starting of a computer
Proper drivers are not installed
possible reasons low voltage battry oil is too thick bad starter
The following are possible reasons to why your computer often gets disconnected from the Internet:Something is wrong with the computer.The software on the computer is messed up.The computer didn't connect to the Internet correctly.You are not paying your Internet bill.
There are several possible reasons, but the most common is that the computer operating system doesn't recognise the file is an executable program.
what are various possible reasons nut not entering in thread
no
the reasons why it is important to download files on your computer
The best and easiest way to quick start a computer is to remove as many start up programs as possible. Each program that starts at boot up takes up time in the starting process.
two possible reasons are its hot and the mountain might be to high