E228WFP Constantly Going Black

I have an E228WFP that I bought with an Inspiron desktop back in October of 2008. The screen keeps going black. It will first happen a few minutes after I turn it on for the day, and then turning it off and on again will bring the picture back, but about 5 seconds later, it's black again. This started happening sometime around last December. I just swapped it out for another monitor we had around the house temporarily because I've been busy, but that monitor is a bit small. So, I'm looking for a new replacement now, but I want to know if there's any way to easily fix this one. Other than this problem, it's an excellent monitor. The warranty is up on it, obviously.