PSU makes a noise, Changing BIOS setting to shutdown on fan failure. Now the computer won't start

"You're right, try to find that manual and reset the BIOS. Before that, you could try to hit Esc to stop any memory test, to maybe allow you to get into the BIOS setup after all. But I assume you've tried that as well.

If you ever get into the BIOS again, you'll probably find some screen that shows the current fan speeds. If none claims to be zero, then maybe the BIOS did not find a faulty fan after all, and this is just some bug, like responding to some fans that are not present at all. I think you cannot be sure that a fan in the PSU is indeed not working at all. Save the money for a new PSU; first try to get your computer to boot again!

If you find that manual, then maybe you can also find connectors on your motherboard for additional fans. If you cannot reset the BIOS (which, however, should be possible I guess), then attaching a fan to any non-used connectors may help your computer boot. You could also make sure that the attached fans are actually connected using all pins on the connector. (To measure the actual speed some feedback is required, which I assume needs more than just two wires for the power source.)

I actually doubted the BIOS would know the speed of any fan inside the PSU. But I stand corrected: a comment from Nikhil states that a PSU may be connected to the motherboard to tell it about the fan speed (and temperature?).

EDIT 2: I happened to see a link to How to Reset Your BIOS at Overclocked too far - computer will not boot here on SU."