my parents bought a pc 3-4 years back made by packard bell. so about year and a half ago it packed in so i bought a new motherboard (abit kt75) new graphics card (nvidia riva tnt2 model 64)processor 1ghz athlon. i kept the old monitor and keyboard etc. anyway the old computer used to display up to 1024 resolution but since i rebuilt the computer it will only display up to 800x600 now. ive looked for drivers etc and downloaded a few ive reinstalled drivers etc and nothing changes. so why would and older computer display higher than a new one. the old graphics card was an onboard chip (sis 5598).