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I'm assuming that you followed the directions in the mboard manual and had the AC power REMOVED to the case / power supply AT ALL TIMES when you were fiddling with plugging in and unplugging connections and components inside the case.
If you didn't do that AT ALL TIMES, you may have DAMAGED something.
Many mboards have an led on the surface of them that lights up when the power supply is supplying DC power to the mboard, even when the computer is NOT running. That led must be OFF when you're fiddling with plugging in and unplugging connections and components inside the case.
The power supply has capacitors that may cause that led to stay lit for a short time after the AC power to the power supply has been disconnected.
It sounds like you have a ram problem.
It MAY be your ram has a poor connection in the ram slots.
See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:
This hasn't got anything to do with ram errors, but READ your mboard manual. Some mboard models support three modules being in triple channel mode, but some DO NOT.
If the mboard DOES support three modules being in triple channel mode, they must be installed in specific ram slots in order for the triple channel feature to actually work.
If the mboard DOES NOT support three modules being in triple channel mode, three modules will be in single channel mode no matter which ram slots you install them in.
If that doesn't help, you may have installed ram modules that are NOT 100% compatible with being installed in your mboard model .....
Patriot ram is known to be more likely to cause you problems if you don't make sure the modules you're using are listed for your specific mboard model by Patriot.
Similar often applies to G-Skil and OCZ ram.
Patriot has a ram configurator program.
Scroll down to Memory Selector
Choose Motherboards, click on Go
You are supposed to use your specific mboard make and model with that to look up which ram modules are listed for (= are 100% compatible with) your specific mboard model.
If the part numbers of any of the modules found by the configurator program are a match to what you bought, then the ones you bought should work fine with your specific mboard model.
If NONE of the part numbers of the modules found match what you bought, then there's no guarantee the ram modules you bought will work properly with your model !.
However, their list of mboard models often doesn't list your specific mboard model, and if it doesn't, there's no guarantee the ram modules you bought will work properly with your mboard model.
(Patriot, G-Skil, and OCZ often don't have your specific mboard model listed. We have frequently heard on this web site about people having problems with G-Skil and OCZ ram, especially, that isn't listed for their mboard model. )
I recently assembled a 100% new system for a friend. He had bought a pair of DDR3 1600 mhz 4 gb "AMD Memory" modules, which are made by Patriot.
I had all sorts of strange problems when I installed Windows 7 Home Premium 64 bit on that system.
Windows Setup completed successfully, but I was getting all sorts of oddball errors in Windows 7, and eventually Windows 7 would not load normally at all. It's built in troubleshooter could not fix the problem(s).
The ram tested fine when I used a bootable ram diagnostics program to test it with, sort of.
It found no ram errors, but that version of Memtest86 is supposed to be able to use all the cpu cores the cpu has to speed up the time it takes for it to complete one pass of all the diagnostics tests, and that wasn't working properly. The cpu , FX-8150, has 8 cores.
The same Memtest86 version on the same disk uses the two cpu cores found on another system I have fine - on an Athlon 64 X2 6000+
I went to the Patriot web site and used their ram configurator program. They DID NOT list the specific model of the Asus mboard I had installed - M5A99X EVO. They didn't list Asus anything above M4A89......!
(Update - they NOW list M5A99X EVO, but the part numbers listed do NOT include the one for the "AMD Memory" modules my friend had bought. )
After having tried installing Windows 7 twice, and having tried MANY ways of fixing the problems, I went to the Asus web site, and compared their list of tested ram modules for the specific mboard model to the ram modules I could buy for a reasonable price locally. I bought a pair of Corsair DDR3 1600 mhz 4 gb modules that are on that list, removed the "AMD Memory" modules, installed Windows 7 Home Premium 64 bit again, and there have been absolutely no problems with that system since.
If you DO have a problem caused by ram that is not 100% compatible, you will have to install Windows 7 from scratch after you have fixed that problem.