5 GPU in what PSU power suply? all gpu its the same?
u can try first with the 5, see on the management devices how many are found and if there its some devide still unknow there, if there is then the 5° card its there, u can try to update that and see if runs,
is dont try to use some software to uninstall all gpu and nvidia or amd card, restart pc, and instal the amd, nvidia software from zero, and see if find the cards
that is alot things that can be, but the problem can be found, just need to post more informations about that so we can try help u