I have a hp zt 1200, that i bought that the screen was broke, i replaced the screen from another unit and now there is no picture, i faintly see Hp when it starts, but when i hook it up to an external monitor, it loads into dos, and i see white or gray lines running up and down, i made sure i hooked everything up like i took it apart, just not sure if it's the inverter, or possible motherboard issue
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If what you say is that all functions are working (start, speed up , down and incline up,down) then the upper console lighting may have loose wire harness( check first) bad soldier connection or the components that generate the images on the LCD are defective. If you have good connections on the wire harness then you may need to replace the upper console.
My friend, I hate to say this however you told me that this was happening after your screen was broke. You have to replace it with a new monitor since it was damaged. That's the best solution we can do.
I am pretty sure you have a corrupted operating system here, or have somehow gotten corrupted video drivers. Boot to safe mode and change the video drivers to Microsoft VGA Generic and reboot and see if that fixes it, If it does, you can experiment with installing updated drivers for that machine available on the HP web site.
Also run a disk check on all drives; sounds like you might have some data loss.
If this does not fix it, consider reinstalling the operating system and then patching it to the highest level possible.
If reinstalling the OS does not work, you might have hardware problems with the screen or motherboard, though this is pretty rare, and is a different matter to troubleshoot.