Mac detects external monitor but no picture

I recently tried hooking up my 17 inch LCD gateway monitor to my 13 inch mac. My mac detects it and lists it under display properties however it does not actually have a picture on the monitor. The gateway just stays black or powers on and then goes black after saying no signal. I have a mini dvi to dvi adapter and then a dvi to vga adapter hooked up, which is then plugged into the monitor. My monitor has a dvi hookup along with the vga input but i unfortunately realized this after I bought the adapter. I figure if my mac sees it I should be able to get it working without buying another expensive cable.
Can anyone help?

I have a HP LP2465 Wide screen monitor. Similiar problem to ScottsMac. The monitor has two DVI inputs. I have a DVI adapter to VGA dongle connected to the monitor (DVI plugged into the monitor) I'm using the Apple Mini-DVI adapter to VGA adapter. The VGA adapter is plugged into the VGA endpoint described above. The Mini-DVI adapter is than plugged into the MacBook. No signal recognized by the computer?
Should I try a DVI to DVI and than get the other cable mini-DVI to DVI connector?
The monitor works fine from an IBM Thinkpad to monitor.

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