"Another quirk is the power light on the PC does not always illuminate green when this occurs the monitor does not come on. Is this related"
Yes they're related - if the system does not fire up then the monitor won't come on.
So your problem is the system won't fire up first time - commonest cause of this is the PSU, but it might also be the motherboard.
Check in the BIOS for the motherboard for the settings on the actions of the power switch.
Also double check that you've wired up the reset switch and power on switch to the motherboard correctly.