Yes, but a 2006 *what*? Also, any computer maker can make an occasional lemon, what did the one you returned do?
iMac late 2006 / 2 GHz Intel Core 2 Duo /4 GB 667 MHz DDR2 SDRAM /Mac OS X Lion 10.7.5
2016 21.5 inch iMac. I suspect either HD or some other hardware issue. 3-5 minute start up vs. 45 sec. for my 2006. Tried all the Utilities i could to repair. Eventually so bad only Safe Mode. Tried to install the newest OS Sierra , Nothing.
They were nice enough to take it back since i wrestled with past the 2 week full return policy ONLY because i stated it was faulty right out of the box.
So when i get the time i`ll try the hack install of el capitan. Worst case is back to square one, still have an original snow leopard disc