"No Signal" monitor crash while playing games

This will be a fairly long post, including full system specs and lengthy description of problem, please bear (bare?) with me.

I know this question has been asked many times on many forums but I figured I'd try my luck and see if anyone has come up with a solution yet. Basically I built myself a decent gaming rig last December and it has been working flawlessly except for one very annoying and frustrating problem, while playing games my monitor will go black with no warning whatsoever and display a no signal message. The sound also loops sometimes. This happens at seemingly random times, could be 5 minutes into playing or it could be an hour or two or it could not happen at all and I can actually complete a gaming session, but that's a rare occurrence. When it happens I must hard reboot using the reset button on front of my case, upon restart I'm presented with the "Start Windows in Safe Mode" or "Start Windows Normally" screen which leads me to believe that everything else continues to run except for my GPU or monitor or whatever the problem may be

I've updated drivers countless times, cleaned all the dust from my case, checked all internal and external connections, moved wires to increase airflow inside my case. I don't believe it's an overheating issue with my GPU as has been suggested because I see no artifacts or distortion of any kind before a crash, the graphics don't even stutter as far as I can tell. I've scoured Google many times and tried all suggested solutions that I've come across that apply to this problem, which seems to be fairly common.

My case has 4 fans all running at medium or higher speeds and my CPU cooler is stock. Thermal paste is what was included on my CPU stock. I consider myself a technical person, good at troubleshooting both PC and Mac problems for friends/family members but this was my first custom build so I wouldn't put it past myself to make some kind of mistake, but like I said the system is very stable and works great except for this.
It may be worth mentioning that my monitor runs at 1680x1050 native resolution which I'm told is high for a 19 inch, maybe changing the resolution could help? But it also looks like crap at any other res. so I'd like to avoid that if possible.

Games that crash often: Crysis
Elder Scrolls: Oblivion
GTA 4 including both Episodes from Liberty City

Games that crash never or once in a blue moon: Dragon Age: Origins
Flatout 2

I'm afraid to even buy games anymore in fear that this will continue to happen and I'm basically flushing money down the shitter. I built this PC pretty much for gaming so it really frustrates me that this happens so often.
Here are my full specs copied and pasted straight from my Newegg order history so I apologize for any needless information.

Antec Three Hundred Illusion Black Steel ATX Mid Tower Computer Case


Crucial 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) Dual Channel Kit Desktop Memory Model CT2KIT25664BA1339

Seagate Barracuda 7200.12 ST3500418AS 500GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive


CORSAIR CMPSU-750TX 750W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power Supply

Acer X193W+BD Black 19" 5ms Widescreen LCD Monitor

AMD Phenom II X4 945 Deneb 3.0GHz Socket AM3 125W Quad-Core Processor Model HDX945FBGIBOX

ASUS EAH4870 DK/HTDI/1GD5 Radeon HD 4870 Dark Knight 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card

Windows 7 OS

Think that about covers it. I'm really hoping someone out there can give me some possible solutions, I can't accept the fact that I spent over $1000 on what I thought would be a sweet gaming rig only to have this BS happen all the time. I'll be checking back often for replies so if I've left out anything important ask and you shall receive.
Thank you in advance for any replies.
Edit: Forgot a few key things and formatted the structure, easier to read...maybe.
2 answers Last reply
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  1. I had a problem similar to this before, even C&C 3 would die in the way you describe.

    I solved it by disabling Spread Spectrum in the BIOS (took me forever to think of it).

    Hope that helps (saved me from RMAing a perfectly good mobo...) :D
  2. Hi anonymous, were you able to solve this problem? if so, please share how??

    I have exact same mobo but HD 5600 series video card. I don't have Spread Spectrum option in my BIOS. I updated BIOS to most recent version, updated video drivers and stability improved but still crashes during Crysis on med/high settings, plays fine on low.

    Any response would be appreciated!
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