It is doubtful that a cmos reset would fix the problem.
The first step is to check the video card and processor seating on the mainboard. If you have added a new processor, your video card may have moved during the install. Take the video card out and reinstall it.
Secondly, if the problem is in the BIOS then you will have to take it to an experienced technician to be reflashed. One of the reasons I bought a Gigabyte m/b was the 'dual bios' to save you from this sort of problem. I don't think ASUS have that feature (at least it not listed on the A7V8X web page).
Don't forget that the Sempron 3000+ runs at 1.8ghz or 2.0ghz depending on the model. So don't expect the bios to show it running at 3.0ghz.
The first step is to check the video card and processor seating on the mainboard. If you have added a new processor, your video card may have moved during the install. Take the video card out and reinstall it.
Secondly, if the problem is in the BIOS then you will have to take it to an experienced technician to be reflashed. One of the reasons I bought a Gigabyte m/b was the 'dual bios' to save you from this sort of problem. I don't think ASUS have that feature (at least it not listed on the A7V8X web page).
Don't forget that the Sempron 3000+ runs at 1.8ghz or 2.0ghz depending on the model. So don't expect the bios to show it running at 3.0ghz.