I have an old Acer Veriton 5700G that run's pentium 4 with 1GB ram and no videocard that has recently started having an extremely high pitched noise coming from the PSU when under load, I paid only $80 for the whole computer and I don't want to have to spend equal that in another PSU when I could just by another computer for that price. I have found one exact match to my current PSU online but it is $120.
http://www.impactcomputers.com/py-30008-005.html
http://www.impactcomputers.com/py-30008-005.html