I in-place upgraded three computers to Windows 10. All three had serious problems with the upgrade. On one the graphics became slow because it had Intel HD 30

I in-place upgraded three computers to Windows 10. All three had serious problems with the upgrade. On one the graphics became slow because it had Intel HD 3000 which apparently doesn't work well in Windows 10. On another the monitor would not turn on when resuming from sleep. On the third, the entire installation screwed up and required a wholesale reinstallation. Those were one HP, one Lenovo, and one homegrown PC. So don't blame it on Dell.