This is a driver issue, but can be a software issue as well. Make sure all drivers are updated and make sure windows is fully updated as well.
Not really. You running windows 7 64bit?
Go here
http://www.asus.com/Motherboards/AMD_AM3Plus/M5A87/#download
and download and install the latest drivers for
1. chipset
2. lan
3. audio
4. USB
Then go here to download the lastest driver for your video card.
http://sites.amd.com/us/game/downloads/Pages/radeon_win7-64.aspx
Could be hardware/memory related. But will be hard to track down which it is.
I would first start out by borrowing a friends power supply to rule that out since you are getting wrong outputs on yours.
Let me ask you this. What are you using to get the voltages from the psu? Do you have something like this? or a voltage meter?
http://www.newegg.com/Product/Product.aspx?Item=N82E16899705003
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I don't trust Aida all that well especially for psu voltages. Either use a multimeter or psu tester.
Wrong voltages will cause random issues.