Dell Studio 1555: replace Mainboard (downgrade)

Hi.

I have a Dell Studio 1555 (ATI mobility Radeon 4570) which doesn't start beeping six times.

As far as I've read, it means that I have to replace the main board because the graphics chipset.

Is is possible to replace with the intel graphics model? Is cheaper and I don't realy need the ATI card.

Thanks in advance