so this happened when after i dissembled my mac, at last time i boot in got frozen at the desktop so i decided to restarted and this is when it got stuck on the boot page with thr white background Apple in thr middle. Later the progress bar will pop up but than for a while with progress bat would disappear while at 0% and you'll see the circle on thr bottom just keep loading. I tried putting in a hard drive with nothing inside, but thr same thing happens.Someone help me plz