new build white screen issue

Finished my new build a week ago. Everything went okay, I installed Windows with a Windows 7 disk from a few years ago. Started setting everything up, then tried installing one of my old favorites, Heroes 3 (great game). Turns out, in order to play in a higher resolution there's an HD mod -- you have to drop an .exe into the folder to play it. Windows 7 wouldn't let me do that so I ended up futzing with the permissions on the C drive. Still, I finally got it working.

Last thing I had to do was update Windows. Here's where I ran into trouble. I didn't download the service pack, I just ran Windows Update. My computer wouldn't install the updates on restart the first time, but the second time things seemed to be going okay. Then I walked back into the room, and I got a white screen, that eventually faded into a darker pattern -- i.e. that I was getting no video signal. I was forced to turn off my system via the power supply on/off switch. The system then booted several times into this white screen.

The next day, I booted it up again and it worked, but it eventually ended up at the white screen again. Today, I decided to reinstall windows in an attempt to fix this (thought I messed up by screwing with permissions). Instead of using my old disk, I tried creating a USB stick, but my computer wouldn't boot Windows from the USB stick. So I ended up using my old disk again, and this time while installing it went to the white screen. Now whenever I boot I hit the white screen again.

I suspect that my motherboard is not functioning properly. Or maybe I have a bad DVI cable? Could definitely use some help here.

Here are the specs:
Case: Fractal Design R4 Arctic White
Power Supply: SeaSonic M12II 650 SS-650AM 650W ATX12V / EPS12V SLI Ready 80 PLUS BRONZE Certified Modular Active PFC Semi-modular Power ...
CPU: Intel Core i5 4670K 3.4GHz Socket LGA 1150 Boxed Processor
Motherboard: ASRock Z87 Extreme6 LGA 1150 Intel Z87 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
RAM: Crucial Ballistix Sport 8GB 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Low Profile Desktop Memory Model BLS8G3D1609ES2LX0
Video Card: Nvidia GTX 275 x2
SSD: Samsung 840 series 120GB
Hard Drive: WD Blue 1 TB Desktop Hard Drive: 3.5 Inch, 7200 RPM, SATA 6 Gb/s, 64 MB Cache - WD10EZEX
DVD Drive, Card Reader
Wifi Card (cause I'm not near my router): ASUS(PCE-N15) maximum performance Wireless-N Network Adapter ( 300Mbps Transmit / 300Mbps Receive) with PCI-E interface
4 answers Last reply
More about build white screen issue
  1. well cards you got are really old and i dont 650 watts is big enough for two 275
  2. bought them off a friend to save money -- thought 650 watts was enough. could it have to do with a mistake I made while building? had to pull out one of the graphics cards and accidentally pulled the slot out of the mobo a bit. I was able to push it back in but could it possibly be loose or something?
  3. very possible a bad connection im not sure of the power requirements for that old of cards
  4. i did a calcualtion that system should require 660 watts minimum so i suggest a 750 watt
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