Alienware x51 constant beeping

I've had my x51 for almost 2 years and just yesterday I went to turn on my computer and it responded with a repetitive single beep. I called Alienware support and they told me it was a motherboard failure, they also told me to try removing the graphics card and disconnecting the CMOS battery, which I tried to no success. I have also tried going into the BIOS menu but it seems my USB ports haves stopped working as well. My computer is no longer under warranty so I can't have it replaced, and I don't have the money to buy a new motherboard. Any help on fixing this problem would be greatly appreciated.