I have an old iMac A1225 model that every time I turn it on it's always stuck on the Apple Logo loading. Eventually it restarts and this process repeats. I have tried booting into the recovery, but I am unable to do so. I press command and r and it doesn't work, and when I press option the HD selection pops up and I click it, but then it goes to the Apple logo where I wait for it go, only for it to restart and yet again be stuck on the Apple logo. I am starting to think this is a hardware problem, but I want to see if anybody else has any input on this issue.