Windows 7 - PC won't start after minor drive changes

After adjusting the Sata drives in my PC my PC won't even boot now. Only added two smaller Sata drives to box...main Windows 7 Sata drive not changed.

When I turn on the start button at the front of the case...the light turns red ( normal ) and the motherboard/cpu fan starts for a couple seconds and then everything stops ?

If I unplug and plug in the main power to the box...the same thing occurs...if I simply try to restart by pressing the start button on the front of the case without unplug/replug...nothing happens.

Unplug/replug...box starts for a few seconds and goes dead....leave main power cord in place and restart......nothing happens.

The led's on my motherboard remain on inside box in all cases with or without power cord attached ?

Any ideas on what's wrong after HDD additions and why my PC will not start up ?

Thanks

sounds like you got yourself a short ,remove the new drives and see what happens

Sounded good to me too...but no joy ! Disconnected all drives/cd/dvd's etc and same issue.

Any other thoughts or any other suggestions on this

recheck your connections, you may have knocked one off or inadvertently placed one wrong way round

That or the PSU died.