The green light on the back is on when plugged in and the orange light on the motherboard is lit but there is no response of any sort when I press the power button on the front. the led on the power button does not light and there is no beeping. Is there anything that I can check to try and isolate the problem? What I have tried is shorting the PSU with a paper clip from the green wire to the adjacent black wire in the 24 pin plug and the PSU fan turned on. I am not a computer guy at all, does this mean that the PSU is ok and the motherboard is bad or is there other things I can check?
That light is normal then, I imagine the orange light is not normal for the motherboard but can't be sure without knowing your motherboard.
This is what I bought from DELL.
Intel® Pentium® dual-core processor E5200 (2MB L2, 2.5GHz, 800FSB)
1 3GB Dual Channel DDR2 SDRAM at 800MHz - 4 DIMMs
1 Dell USB Keyboard and Dell Optical USB Mouse
1 20 inch S2009WFP Widescreen Digital Flat Panel Monitor
1 Integrated Intel Graphics Media Accelerator 3100
1 320GB Serial ATA Hard Drive (7200RPM) w/DataBurst Cache
I am not sure if that tells you anything about the motherboard that it has.
I have the same problem but it's not the PSU i bought a new PSU an ULTRA LS 400w the computer still has the solid orange light but still doesn't start also the fan turns on then stops so it's defiantly not the PSU i went to dell forums and made a post about the problem. This is what they responded