Re: On startup - monitor stays idle
Num Lock light could actually be several things, but one of them could be a motherboard failure. If you can, try to test the primary monitor on a different tower. With the sounds of it, it looks like the monitor is more than likely not the issue if a 2nd monitor isn't working either, but it doesn't hurt to run a quick test.
My guess would be if the monitor/s is in good condition with another computer, you are looking at some internally wrong with the motherboard. Electricity is flowing on the Mobo for the computer to turn on and start the fans. This means that most of the circuits are still in good condition. But there is something preventing the display to be started. When you turn the computer on, does the computer have a "beep" sound a few seconds after it starts up?
PSU:OCZ 600W modular - Mobo:ASUS P8Z68-V PRO - Processor:Intel Core i7-2600K - CPU Coolant:ZALMAN CNPS11X Extreme - Memory:CORSAIR Vengeance 8GB DDR3 1866 - Hard Drive:4.0 TB Seagate Barracuda XT 7200 RPM SATA 6.0Gb/s - Video Card:NVIDIA GeForce 7950 GT 512mb - DVD Drives:Sony 18x DVD+/- DL Burner and Samsung 18x DVD+/- DL Burner - OS: Windows 7 Ultimate 64-bit