Having an unusual problem with my computer.

I have 4 hard drives in my PC, 2 IDE and 2 SATA. Now for no reason what so ever they all started clunking and making weird noises. Like they were trying to spin up but kept failing. This happens for about the first 5-10 mins the comp is powered on and no OS will boot while they are fart assing about. I first thought i had dodgy hard drives but then for 4 hard drives to all go at the same time....those are some odds.
I swapped out the power supply and low and behold the clunikg stopped my PSU is a Antec Truepower 480 which i have had for about a 20 months (i think).

Has anyone heard of anything like this happening before??