Mac Pro doing weird stuff at boot !!!

Hi
I bought my mac pro just 3 months back.
now its not booting up...
i started facing this problem maybe 2 months back.
basically i used it for a month with no issues and then suddenly one fine day it decided to not boot up.
i tried everything from all the resets to disconnecting everything except the monitor n keyboard n mouse,
but still nothing. there were 2 red lights on inside. one at the top on the vertical board and one on the lower board.
then after 15 mins of trying it started up.
so i sent it to apple service center as i have apple care.
they checked n said that it was the way my ram was put in (funny part here is that the mac pro itself told me to put the ram in that order when i first put it in)
so i got it back n it started working fine for a few days.
then again like last time it didnt boot up.
same red lights and no boot for sometime n then boot...
then a new thing started up....the fans started running at really high speeds.
they go on n off....speed up slow down....erratically...
but mac boots fine n works fine.
i did a apple hardware test n got a 4sns error....i checked online for it and didnt really find the exact error definition anywhere, but got to know that basically a 4sns error is a sensor error.
so i sent it back to service center.
this time i made them boot it infront of me...and it booted up perfectly...
so i left it with them to test it properly...
they called me 2 days later n said that there's nothing wrong with the machine n that they didnt even get the 4sns error....
they also told me that it must be a wiring issue in my house...earthing stuff..
i got it back again n tried to boot it but exactly the same thing like last time.
no boot at the beg, then boot with fans behaving erratically...
so i decided to buy a new ups and also check the machine at all the other points in my house....same thing again...
now i dont think its possible that every electrical point in my house is wired wrong...
so i spoke to the tech guy at the service center n he told me to take out the extra 4gb ram that i had added 3 months back when i bought the mac.
i did that but same thing...fans speeding up n down...
so i spoke to him again....well now he's sending a tech to my house to see what is really happening...
im depressed....n im seriously dissappointed with apple..
mac pro's are not supposed to do this...
so much of my work is suffering...
please help n advise...!!!

I saw poeple with undersized UPS have trouble so the VA rating.
Some outlets are still part of a larger circuit, and you don't want a windows A/C or fridge also pulling. And of course home wiring, grounding, etc.
Your UPS if APC, Cyberpower or good name will tell you if there is a ground fault.
Did you ever test wtih just the new RAM in the proper DIMM slots?
Wait for a tech. I'm glad I could get an electrician to wire some outlets. And I much prefer building my own PCs and doing my own servicing.
The SMC RESET method keeps changing, but unplugging everything, all cables, then I would hit power button for 10 seconds. Wait. a minute, then reconnect the power, kb/mouse and video cable and power up. On a PC removing the CMOS battery (PRAM battery) for 15 minutes too.
I worry that travel and carrying that something can loosen up, even RAM DIMMs or battery or something.
"RAM was put in funny" though sounds suspecious. You did it by the booklet (by the book) and according to the RAM Utility guide instructions.
Apple has a service diagnostic and maybe it is the cpu daughter card.
You only need one DIMM to boot. Might go through some trial and error of one DIMM in one of the slots.
Please list what you can - something like:
Mid 201 Mac Pro 5,1 2.8GHz 3 x 1GB 4-core ATI 5770 etc

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Thank you for your reply,
Pull all the drives you have other than the one that you will install Windows 7 to.
I think I will try this next.
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That was initially what I started out doing.
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Hmm, I think I'll try that.
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Mac Pro doing weird stuff at boot !!!

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