In Parallels 16, my Windows 7 VM includes the following in the config.pvs file:
	Code:
	
         <HideBiosOnStartEnabled>0</HideBiosOnStartEnabled>
         <UseDefaultAnswers>0</UseDefaultAnswers>
         <CompactHddMask>0</CompactHddMask>
         <CompactMode>0</CompactMode>
         <DisableWin7Logo>1</DisableWin7Logo>
         <OptimizeModifiers>3</OptimizeModifiers>
         <StickyMouse>0</StickyMouse>
         <PauseOnDeactivation>0</PauseOnDeactivation>
         <FEATURES_MASK>0</FEATURES_MASK>
         <EXT_FEATURES_MASK>0</EXT_FEATURES_MASK>
 After changing the line 
	Code:
	<DisableWin7Logo>1</DisableWin7Logo>
  to 
	Code:
	<DisableWin7Logo>0</DisableWin7Logo>
  and rebooting the VM, the boot logo appeared again.