after installing the server, you restart the computer.
Windows starts as expected, but the sql services do not start. server does not start because 1) hard disk space is insufficient 2) sql server installation is corrupt 3)registry is corrupt 4) pagefile is too small 5) services are not set to auto start
There is insufficient information to appropriately answer this question. You wouldn't know which of these is correct without additional information collected from the server. However, there is a guess that your interviewer or teacher is leading you towards. Which do you think it is?