Possible PSU problem

[micul]

I do not know how to begin the problem I have. A week ago I started the computer, but after I was typing my login password the image will freeze. After a few seconds the monitor go black but i could see the logon screen in background. If i was leaving a few seconds more, artifacts where appearing.

My setup looks like this :

CPU - i5 2500K
Motherboard - Asrock P67 Fatality
Video Card - EVGA GTX570
Memory - 2x2 Gb GSkill RipjawsX PC 17000
1x 90Gb SSD
1x1Tb HDD
Power Supply - Cooler Master Pro M700
CPU is water cooled.

The system was not overclocked at that time. I changed the video card thinking that the card is dying. Having a few video cards i installed a BFG GTX280. After the logon screen i was having same problems. After all this, i installed a HD5450 and all the problems are gone.

My questions are :

- Do you guys think that my power supply is dying?
- Did i took the right decision to order a new power supply?
- Is Corsair AX750 a good choice?


thank you.

[_dangtx_]

both your main cards are nvidia,could be a soft problem, although both suck way way more than the ati so it could be the psu yes.

load up a live cd with either nvidia card and check again

the ax is a good unit, of course. bit overkill for one card though.

[micul]

Last night i reinstalled windows. Everything was good , but after i installed nvidia drivers problems reappear. Tried 2 different drivers but the results are the same.

[_dangtx_]

when you install drivers the card kicks up to speed,consuming more power.

can you try a live cd,ubuntu or the like?