I've been into some kind of loop error before and I contacted tech support about it. They said that somewhere in the process, the PC was not shutdown properly, the system memory gets corrupted and has to be cleared out first. And one way of doing that is by doing a power drain procedure. I am not sure if this will work for you but there's no harm trying it if you are desperate. The steps are so simple. Here it is:
1.Turn off computer and unplug power cord.
2.Disconnect everything except monitor, mouse and keyboard.
3.Press power button and hold for 30 seconds.
4.Plug power cord back into computer and press power button.
5.Check front panel LEDs (lights) on bezel (front face) or optical drives and listen for power supply fan.
6.If LEDs are on or power supply fan starts spinning, watch for boot screen on monitor.
7.If computer begins to start, turn it off.
8.Reconnect any external devices.
9.Press the power button and make sure the computer starts.
If this doesn't work, you would probably need to do a system recovery. And for that you would need your Bootable rescue disc and the recovery media you have (either USB or DVD). But if you have an image back-up, that's a good alternative.
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