When I plug the computer in there is a solid amber light on the motherboard so I know the board is getting power, at least at a basic level. However, when I press the power button nothing happens. The power button doesn't light up, the fans don't spin, nothing beeps. Nothing.
I'm thinking the psu is dead so I was thinking of getting a replacement. What form factor is the psu? I'm unfamiliar with the sizes. An authentic vostro 200 psu looks to be £60+ so there's no way I'm getting one of those. I guess I'll dump the components in a larger case and put a full atx psu in there for probably the same price.
Unfortunately, this is a sign of a bad motherboard as well. You may end needing a power supply and motherboard.