Hi, folks! Gird your grid for a very long OP describing a truly baffling puzzle. I apologize for the length, but I've spent a great deal of time and effort researching this issue and experimenting and testing various hypotheses, so I've provided a lot of details which I hope will allow you very capable folks here to help me solve this... I use my Dell 1526 laptop running Win7 SP1 primarily for watching streaming video from Netflix, and, until recently, it has worked perfectly for a few years now. It has HDMI output that I connect to my Sony HDTV through a Yamaha AV receiver. The laptop is always plugged in (instead of on battery power). But since about mid-December 2012, every time I watch anything on Netflix, within roughly one hour of playing (sometimes less, sometimes more), the laptop suddenly just shuts itself off within 1-2 seconds, with no warning or error whatsoever! And now I can say with certainty that streaming from Netflix is the only thing - the single, solitary, ONLY thing that causes the problem! I can use the laptop non-stop for any number of hours and days in a row to do anything at all (other than watching Netflix), and the machine will never, ever shut down or show any other problems. A crucial point to note and keep in mind is that I can watch streaming HD video from other sources I've tried -- including Amazon Instant Video, Hulu, and even YouTube -- for any number of hours, but these other sources NEVER cause the power-down problem that occurs every single time I watch Netflix! (The only difference between Netflix and these others that I'm aware of is that Netflix uses Silverlight while the others all use Flash, but I don't know it that's relevant). Anyway, when I power it back up after this occurs, the event logs shows nothing relevant except for the expected ones: "Event ID: 6008 - The previous system shutdown at <time> on <date> was unexpected.", and "Event ID: 41 - The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly." So I checked all the usual suspects... • Was there a temperature-related failure? NO: Both CPUID's HWMonitor and the Open Hardware Monitor both showed that the CPU temperatures never exceeded 174° F / 79° C (AMD's spec says the max is 203° F / 95° C). The disk temp never exceeded 108° F / 42° C. • The graphics card doesn't report it's temperature, but I experimented with that, too, and I'm confident that's not the problem either. Why? Because, as I mentioned above, I can watch streaming HD video from Amazon for hours upon hours with no power problem, but surely the graphics adapter would get as hot or even hotter than it would watching less than an hour of Netflix. So that explanation simply doesn't wash. • Could there be some external power problems? Maybe there was something wrong with the AC adapter. For the first month of this problem, I didn't have a battery attached to the laptop, so I began to wonder what would happen if there was. Would the battery take over when the sudden shutdown occurred, as always happens when I deliberately unplug the adapter while it's running? I bought a new battery, charged it up and connected it to see what would happen. But whether the battery is connected or not, it makes no difference whatsoever. Therefore, between that and the fact that the power issue never occurs when I do anything other than watch Netflix, it proves that there's no external power problem. • Maybe it was a Firefox issue? I then tried the two other Netflix-compatible browsers, IE and Chrome. It turns out the same thing happens regardless of browser. • Microsoft usually asks people to test things out in safe mode to see if the problem remains, but that's both impossible and totally irrelevant in this case because, as I described above, everything works perfectly in full Windows mode for any length of time, as long as I don't watch Netflix. • I also considered another issue that's apparently unique to Netflix: When one watches Netflix long enough, a special kind of "pop-up" comes up that pauses playback and prompts the viewer to either (1) Continue, (2) Play it back from the beginning, or (3) Return to browse titles (if I recall the options correctly). Interestingly, after this power-crash started happening, I've never seen that prompt again. In fact, for weeks it very much seemed to me that the power crashes occurred right about the time I expected that pop-up to appear! Now, however, it seems that the power crash is happening too soon -- often after only 20-30 minutes -- for that pop-up issue to be involved. That's all I can think of to report, but I'll happily provide more info upon request. So, folks, any ideas? [HR][/HR] Brief system summary: Dell 1526 laptop running 32-bit Windows 7 SP1 Home Premium (My profile provides more detailed system specs). All updates and hotfixes have been applied. I've uploaded a rar file some additional info, including CPU-Z report and screen caps, MSINFO32.nfo, etc...View attachment AdditionalSysInfo.rar Thanks!