Don’t know what “….several remedy suggestions….” you tried but here are some that may help to prove whether it is a software problem or a hardware problem.
Try starting the tablet in safe mode and check the screen.
If it continues to operate in colour then a downloaded app is the cause of the problem. The trick is to find out which one is the culprit. You will have to uninstall each downloaded app, one by one, and test the tablet in normal mode between each uninstall until it operates correctly. The last downloaded app that was uninstalled was the cause of the problem.
If it still fails to operate correctly in safe mode try wiping the cache partition and check if that resolves the problem.
If it still fails to operate correctly after wiping the cache partition, try factory restoring the tablet.
Be aware that a factory restore (aka hard reset) will erase all your data and downloaded apps. It will restore the tablet to its’ factory default condition (or last system updated condition), so backup the tablet before performing a factory restore.
Once you have backed up the tablet to the cloud or a PC etc, using the tablet’s backup feature, factory restore the tablet using the tablet’s factory restore feature.
Once the tablet has been restored to its’ factory default condition check the the screen.
If it is still in monochrome then you have a hardware problem.
If it is OK (allow a bit of time to satisfy yourself that it is really OK), restore the tablet with the backup that you made earlier, using the tablet’s restore feature.
Once the tablet has been restored to what it was check that the screen is still operating in colour OK. If it is then the reset has resolved the problem.
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