Before booting the computer make sure all your components are installed properly. When the computer is booted, the basic input/output system (BIOS) performs. The BIOS contains a setup program used to check settings for hardware devices. This check is called a Power-On Self-Test (POST).
POST checks to see that all of the hardware in the computer is operating correctly. If a device is malfunctioning, an error or a beep code will occur. Typically, a single beep denotes that the computer is functioning properly. If there is a hardware problem, the computer may emit a series of beeps. Each BIOS manufacturer uses different codes to indicate hardware problems.
The configuration data is saved to a special memory chip called a complementary metal-oxide semiconductor (CMOS). CMOS is maintained by the battery in the computer. If this battery dies, all BIOS setup configuration data will be lost. Some motherboards have Dual-BIOS feature to prevent losing CMOS data.
To get into the BIOS setup program, you must press the proper key or key sequence during POST. Most computers use the DEL or F2 key.
Some Motherboards come with integrated video and audio, when installing video card and sound card, you need to disable the integrated video and audio device from BIOS, however, some motherboards will automatically disable integrated video and audio device once you install new Graphics card or Sound card.