Monitor and computer seams fine to me.. except the GPU. (a GPU is the graphics processor)
You want to play Sims. It's not a demanding game, but still, the GPU you have is an onboard one. It on your CPU it self. (a Cpu is the main brain in a computer). It will play Sims, but it's not gonna be pretty.
You should ad a dedicated graphics card to it. a cheap one will do for Sims.
I found a GT 640 on sale for only 58£. It has more than double the performance as the inbuilt Radeon HD 8470D chip.