Agreed...somethings not seated correctly (Useally Video Card or Ram) or the CPU fan is not pluged into the correct fan header on the board...ect. Here's a basic error codes for a motherboard useing an Award bios..
Award Beep Codes
1 Long Beep: Memory problem
Explanation: There is a failure of some sort related to the system memory.
Diagnosis: The first bank of memory probably has a failure of some sort; this is usually just a physical problem such as an incorrectly inserted module, but may also mean a bad memory chip in a module. It is possible that there is a failure related to the motherboard or a system device as well.
Recommendation:
* Treat as an apparent memory failure.
* Troubleshoot the motherboard.
1 Long, then 2 Short Beeps: Video error
Explanation: The BIOS is unable to access the video system in order to write any error messages to the screen.
Diagnosis: This is usually caused by a problem with the video card, or the memory on the video card. It can also be a motherboard issue.
Recommendation:
* Troubleshoot the video card.
* If the video card is not at fault, troubleshoot the motherboard.
1 Long, then 3 Short Beeps: Video error
Explanation: The BIOS is unable to access the video system in order to write any error messages to the screen.
Diagnosis: This is usually caused by a problem with the video card, or the memory on the video card. It can also be a motherboard issue.
Recommendation:
* Troubleshoot the video card.
* If the video card is not at fault, troubleshoot the motherboard.
Continuous Beeping: Memory or video problem
Explanation: The system is producing constant Beeping in no specific pattern, or a fast "ringing" sound.
Diagnosis: This is usually caused by a problem with the system memory, or possibly the video card. The memory is more likely--the system complains long and loud if it can't find any usable memory, as there is no way to even start the boot process when this is the case. The motherboard itself could also be the problem.
Recommendation:
* Troubleshoot the system memory.
* Troubleshoot the video card.
* Troubleshoot the motherboard.