There are many factors that can cause your computer not to start. These could be hardware issues i.e. Hard Drive failure, Overheating, Power problems etc.
Over 15 years experience in diagnosing computers helps me to pinpoint the issue quickly and then inform you as to what would be involved in getting your computer up and running again. Sometimes it’s not worth repairing and it’s nice to be given the option rather than getting a big bill for repairing a system that may not be worth the cost of repair. It’s always your call on repair costs.