I am working on a Dell Latitude D610 laptop. The issue being the monitor would randomly go black during BIOS, it works fine with an external monitor, so I figured it was the inverter. I bought and replaced it, now it stays on longer but still goes black, unless I hold the button down that tells the laptop the screen is closed for a few seconds then release, after that it will either go black again, or stay on for indefinitely until a reboot then the problem repeats itself. Is this a monitor issue or a problem with the close button itself? Thanks for any help!