Hi,
It looks like onboard will not support that resolution 1400x900,
Get yourself a graphics card,
A gigabyte ATI radeon 4670 will do everything includes the latest games, (not on full settings though) but it is the best bang for buck as they say,
Look around and it 's about £50 £60, if thats too much go for any of the 4 series cards,
Most of them will do dx10,
Merry Xmas