Family PC, possible motherboard issue

My brother booted it up about an hour ago and it pretty much stayed at the BIOS POST screen for a few minutes before shutting itself off, then repeating the same long beep, short beep code over and over. Trying to start the system again would have it playing the code again, and nothing showing up on the monitor. Any clues/ideas as to what's going on?

System specs:
Make/Model: HP Pavilion a6330f
OS: Windows 7 Home Premium x86
HDD: 250GB Western Digital Caviar Blue
CPU: AMD Athlon 64 X2 5600+ Windsor 90nm Technology
Motherboard: ASUSTek Computer Inc. NARRA2 (Socket AM2)
RAM: 3.0 GB Dual-Channel DDR2 @ 312MHz (5-5-5-15)
Chipset/Graphics: Nvidia GeForce GT520 (Displaying to monitor via HDMI)

sounds like a memory problem - try and re-seat the memory and / or try one stick ...

I'll be doing that in the morning when there's light to see, but I'm gathering suggestions and hypothesis of what could be causing the issue so I have a list of things to try when I get to it at daybreak.

Open this page: Computer Does Not Start and Emits an LED or Beep Code | HP® Support Scroll down to Beep codes and LED descriptions and check if one of those applies, there are several BIOSes listed as well as common HP beep codes.

I located that page a few moments prior to you posting it Britton, I'll do a RAM re-seat first, if that fails I'll be running MEMTest on it.

Also, do a Clear_CMOS procedure. If the RAM had become 'overclocked' for any reason, and that keeps the PC from booting, then this is how you would recover.

Another thing to check - in the bios - is the right drive set for the first boot device ?

Alright, got it all fixed up. I used some cans of compressed air I brought at the electronics store and blew out all the dust bunnies festering in there, then took out the RAM sticks and put the two 1GB sticks where the 512MB sticks were and vice-versa for the 512MB sticks, booted right up.
Thanks guys!