Hi, I have an Intel D845GBV that has been working fine for over 2 years now. Today, it simply will not start.?

I can power it on but I see nothing on the monitor and both the power light and the HDD light are on. I checked and replaced the memory, but that seemed to make no difference. I did the same with the video card, but that made no difference either. I tested the power supply and the hard drive on another computer and they are both fine. I finally decided to reflash my bios, I did, and my computer started and booted for a brief minute. After the process of flashing my bios was over, I restarted my computer, and it would not start again. I can't seem to find istance on this motherboard anywhere since it is almost obsolete. Please help :(