Depending on the Bios manufacturer the beep codes are as follows:
1)Award-3 short 1 long beeps would indicate that you have a video card problem
2)Phoenix-indicates that this beep error means that you have a bad chip on the motherboard and theboard will need replacing
Start your troubleshooting by opening the case and reseating the memory modules
Take out the video card and replace with another card,if this is onboard video,you may try disabling and installing the video card on themotherboard in PCI or AGP slot
If found to be faulty video card,replace with another card,otherwise with onboard video chip you will need to consider another board