Well this sucks

[Reece]

So recently I decided that my old compy needed some updating

Is there any of the ol the old parts still being used? Is it a new mobo?
If it's the old mobo then try removing all the cards and use the old ones to see if it runs. If it is a new mobo the I would say an update is not the correct term!!
Is the power supply new or old?
If you have access to a multimeter I would check the voltages at the pins on the mobo, turn it upside down and check at the solder joints, this would at least check if power is getting to the mobo. Any burn smells?