Final Analysis

Based on your input:

The computer turns on but there is no video to indicate what is going on.  PC seems to receive electricity

Conclusion: 

Hardware failure - see repair price below

Quote for Parts, Labor, Taxes, Fees (all inclusive)

Desktop Computer  between $195 - $280

In Case the problem is your Computer Monitor - please review broken monitor options

Laptop Computer  - Repair not available for this problem.

*if your motherboard requires replacement, you will need to reinstall your aftermarket programs (programs installed after you purchased the computer)