How to replace the power supply on an emachines ET1161-07

That normally signals motherboard or power supply. Most of the time, power supply. Try paper clip test to determine if PSU is bad. You can get a replacement for about 20 bucks

http://www.cputopia.com/emachine-480w-c-series-c2685.html

In my opinion you have a faulty power supply, replacing only the fan may not solve your problem. Try replacing the power supply.

There can be two problems with your PC. either the power supply is faulty which is highly probable, and the other is that your Motherboard maybe faulty or both things are faulty. Try replacing the Power supply first. It should solve your problem.

This is a common problem with Emachine motherboards, the problem is the power supply is a best tech and allows voltage surges to the motherboard which fries it too. If available you usually have to replace both the power supply and motherboard. I do not know what exactly goes bad on the motherboard but I have replaced many emachine power supplies and motherboards. The motherboard kit which used to be available from Emachines included a power supply and no warranty if you didn't change the power supply. They knew they had a problem.

Had the same problem and ended up replacing the PSU. Try re-seating the memory and video card first but if your not getting any power on beep codes then it is likely that the PSU and possibly the motherboard have failed (google emachines power supply failure).
Try a new PSU, it worked for me and was a fairly cheap fix if nothing else works.

Yes, any power supply will do as long as it fits in the case.

Either a regular power supply

or

a Micro power supply

They can be purchased online from Tigerdirect in any number of wattages.

yes

reinstall your windows

most common one is the power supply, should cost about £20 for a replacement and are easy to fit, if you need anyhelp just ask

It's more than likely the motherboard needs replacement.