Certain websites with embedded video and/or flash are causing my system to freeze. It is hit & miss, but YouTube, ESPN, PayPal, my online brokerage site, and others will load and within the first 5--10 seconds will cause the graphics to hang, forcing a manual restart. Mouse, keyboard, everything freezes.
When the system reboots there is no error message apart from the bootscreen that says Windows did not shut down properly.
Problem started in 7/2013 using Chrome, so I switched to Firefox -- until it began having similar issues; IE behaved likewise. Over the last year I have been using Opera, but the crashes are becoming increasingly frequent (and I'm out of browsers!).
There is a similar issue posted here: https://productforums.google.com/forum/#!topic/chrome/3g-MPkJ188E
(Though I don't have an issue with the increased speaker noise.)
The forum post above concludes that HTML5 videos are causing problems and to disable HTML5 viewing. But this has not seemed to help.
Is this a graphics card problem or a motherboard problem? System is 4 years old.
I've of course applied every software/firmware update to the graphics card, as well as all Java and Adobe software and plugins for all browsers. I now appeal to the bright minds here-
64-bit Win 7
ATI Radeon HD 5700 Series (driver v.184.108.40.206)
Corsair XMS 6GB DDR3
Chrome 28.0.x (unused in last year...)