Computer doesn't boot up

I acquired an older model Dell desktop pc (Optiplex GX280) that I was hoping I might be able to use. But when I power it up all I get is a black screen on the monitor with text along the top of the screen "X300 SE 64MB BIOS P/N 113-126005-100". Nothing else happens; however the fans run and I checked inside and the hard drive is hooked up fine and no unconnected wires or anything like that. I googled that text and apparently all it is is the graphics card that it is apparently being detected but like I said there's no indication otherwise of the computer booting up, no splash screen, no other messages or anything other than what I just described. Any thoughts on what the problem might be, how I can further investigate what might be wrong? Thanks

Computer doesn't boot up