Installing an external hard drive in my tower

can any 1 help? ive tryed 2 put my external hardrive in2 my tower as it stopped working,and have it as 2nd hard drive ,i have connected it properly but the tower cant seem 2 find it?
 
Are you saying you're trying to install external drives internally? So you removed them from their enclosures? Are these SATA or ATA/IDE drive? Does the BIOS see the drives? Which motherboard do you have?
 
yes took ti out its encloser lol and its only showing up my hard drive not the 1 i just put in.the tower works fine but i need that other hard drive asit has all my stuff on it
 
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