System won't Start-Up

Have you checked the power supply outputs yet? That would be my first thought. Second would be a bad motherboard.

It does sound like the power supply has failed.
Unplug the power to the CD-ROM and try again,
if still no boot, the p/s is bad.

It could be from several things dmiles. I would first suspect the PS as suggested. But I have seen the switch cause this issue (power switch), along with case sensors (some cases have sensors. If a door is open, it will not power up).
If all of those checkout, look to the MB.
On the MB, make sure that everything is plugged in properly, including the switch, and that the wires connect to their proper places.
Put a new cmos battery in place.
reset the cmos
if these dont work, try another MB

Could be a bad power switch. The reset is identical on most ATX boards; try putting the wires for that on the header for the power switch.

Also, if you do a lot of this sort of thing, this power supply tester would come in handy. For under $20 I find it paid for itself the first time I used it.

http://tinyurl.com/e4sz6

The power supply needs to be replaced. You could purchase a power supply meter on geeks.com for about 10.99!!

This confirms what I suspect was the PS,I have changed the PS and now the MB is getting power,the problem is I am not getting the system to boot,the CPU fan is working so is the PS,yet I am not getting anything to come up on monitor
I am checking the switch,this may be a problem because it does stick when pushed in.

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