XPS 14 (L421X) will not boot and continuously beeps

I first experienced this problem a couple of days ago. When I try to wake my laptop up from sleep the screen will not light up, though the backlight for the keyboard will, and the computer beeps continuously (I've let it go for about ten minutes). The only way I can stop the beeping is by holding the power button until the computer turns off. When this problem first happened a couple of days ago I left my laptop alone for an hour and it came on without a problem and worked fine for two days. However, this started happening again last night. I let the laptop sit overnight but it still wouldn't turn on in the morning. I let it sit again while I was at work but it's still not working. Any suggestions would be appreciated.