"Complete system specifications" also include RAM, PSU, and case. For this problem, the case irrelevant. The RAM might be. The installed PSU matters.
Also need a better description of the problem.
Is the PC passing the POST and booting to Windows? If so, how do you know?
Or is this a classic "no boot, no video" problem?
For that, work systematically through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-posting-boot-problems
I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.
If that doesn't work, I have some more advance troubleshooting ideas.
Does the monitor work with another PC?
Does the 460 work in another PC?