hardware or software issue

Ok guys i will try to give as much info as possible.

I have bought a new computer, and it worked for 2 weeks without any problem. And today I was working on it, was downloading some stuff via rapidshare, and opened a game, 2 mins into the game my screen goes blank, and my PC resets.. was thinking wth.. ok maybe some win 7 update or somthn.. But then screen come on, BIOS boot shows and after it i get a sign similar to this one "&" and it fills up my whole screen, somthn like this..

__________________
I&&&&&&&&&&&&&&&I
I&&&&&&&&&&&&&&&I
I&&&&&&&&&&&&&&&I
I&&&&&&&&&&&&&&&I
I&&&&&&&&&&&&&&&I
I&&&&&&&&&&&&&&&I

after that i get: the usual windows was closed bla bla. do you want to start it normally, i click on it and I get my loading screen with such low graphic.
you have a black screen with some black purplish dots, and my logo has like 4bits, and horrible colors. and it wont pass the boot screen.
When i try to get it in safe mode it works fine, no problems what so ever.. Any one having any thoughts on this one?

Computer spec:

MBO ASUS P7P55D, iP55, DDR3, zvuk, S-ATA, RAID, G-LAN, CrossFireX, PCI-E, eSATA, FW, ATX, s.1156
CPU INTEL Core i5 750 BOX, s. 1156, 2.66MHz, 9MB cache, 64 bit, QuadCore
VGA PCI-E XFX GeForce GTX 275, 896MB DDR3, DualDVI, HDTV
Napajanje 650W, CORSAIR TX Series CMPSU-650TX, ATX2 v2.2, 120mm vent.

OS: win7 enterprise

Can you give me any advise what to do.. did anyone have similar problems?
I just hope its software issue and not the hardware..

I'll be checking this post intensively and give replys asap so if you need any additional info feel free to ask.

Thank you for your time and effort.

Br,
Damir

Hi,

First of all thank you for the reply..
The problem is I didnt get any blue screen, only reset.. and thats when my problem started.. I will try to repair.. a friend suggested i try hirens boot CD to test the hardware to see if the problem is software of hardware.

Br,
Damir

i checked it.. but still loss of a power supply would be visible when i use it intensively via games or somthn... but that wouldnt explain the problems i'm experiencing..
with power supply is the same either you have power and it works or you dont have power and it restes or it doesnt work..
so i could turn on my comp and it would get to win boot screen and stayed there for indefenetly (grammar)..

Br,
Damir