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SP1908Fp goes black, fixed!
I have a SP1908Fp monitor that was doing the same thing. In fact, I've read where this is a common problem with Dell LCD monitors. The problem grew worse over time. I would power on the monitor, it would light up, then go black. I would turn it off, then back on, it would light, then go black. After a few times, it would stay on. Eventually, however, it just wouldn't light. The power was on, but the display didn't come on.
I discovered the problem was with a few capacitors on the display circuit board. Now, this isn't for the faint of heart. Only people with electronic component experience should do this. However, when I opened up the monitor, there were 4 capacitors that had "bulged", a sign they are defective. I simply replaced them with the same size/rated caps and it now works great!