I am fascinated by the idea of having to set the PC timeout equal to the display timeout, and wondering whether this might be a solution to my laptop which is a devil to restart if I have to press the off button instead of switching off correctly.... not sure how to do this.
Anyway, again, off topic, but you boutght a Dell. And you didn't buy it from Dell. It would take me the rest of the morning to recount my tale, but suffice it to say that I did a similar thing, and Dell 'Support' was a nightmare, as was the machine. After 7 months, they finally decided to replace the machine, and I paid and extra £300 for what turned out to be a great machine, but the support nightmare continued until the gifted extra warranty at last ran out. My advice to anyone is Don;t Buy Dell ... But if you must buy Dell, don't buy cheap. And don't rely on Dell Support - maybe buy from Currys, or whatever your equivalent is.
As to whether PC equalising timeout to display timeout, any simple instructions or a link to somewhere? I might just try that. Otherwise considering going Mac next time round.