M90Z display not recognized after cover removal

Hard drive failed.  Replaced with new SSHD 1tb drive. Cover not yet replaced (very difficult to accomplish).  When computer is turned on to reboot, a message appears:
"No signal input.
please checkcable connection and / or
whether you are in monitor mode."
I cannot tell from the maintenance manual diagrams exactly which connection might be affected.  Using front panel icons will turn off the message but does not show anything on the monitor.  New hard drive seems to run, fan seems to run.
Recovery disk (on flash drive) in USB port is powered on but does not boot.
I have no idea what else to check, or how to do it.
Thank you for any help

Welcome to Mac-land.
This wouldn't happen to be a WD external drive, would it?
Is there some utility on your Windows laptop that you can use to repair the external drive? Something equivalent to Disk Utility on a Mac? I'm not a Windows guy so I don't know.
If the data is still on your Windows laptop, then maybe your Windows machine can erase the drive enough for you to get it to mount on your Mac.
Another option might be to see if your Mac will boot into recovery mode (restart and hold down ⌘R until you see the Apple logo), and then maybe Disk Utility (you'll find it when you boot into Recovery Mode) would be able to see the external drive and either repair it or reformat (erase) it.
Occasionally Techtool Pro 7 will be able to repair something that Disk Utility can't. Techtool is a good thing to have; it's the only third party maintenance/repair utility that you need. Techtool installs a repair partition (the eDrive) on your internal hard drive, similar to the recovery partition that is already there with Mavericks. So you might be able to boot into the eDrive and then see the external drive and either repair it or format (erase) it so it will show up under normal boot conditions on your Mac.
It seems less likely, but perhaps your external drive has chosen this time to die. If you can't get it to mount/erase/repair with either machine then that's probably what's going on.
Less likely than that, but still possible, is that the problem is with the external is in the enclosure itself, and not in the drive within, so if you can't get it to work any other way, it's worth a shot to remove the drive and put it in a different enclosure and see if it will work.

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