had bought a used Acer, in which the owners had unfortunately lost the power supply. So therefore amazon, new PSU ago. I use the part for a Acer Aspire 8530G. the laptop is charging and operation works on the mains without any problems. I have the power adapter now for about nine months, and it shows no signs of fatigue. the AC adapter has a small green LED which signals the supply of electricity. on Lapttop goes once it is connected to a blue lamp.
However, one must mention that the power supply is temporarily extremely hot. hot in this case really means that you can touch it no longer than 3 seconds without burning your fingers. it should therefore lie on a fireproof surface.
