You were right about using the + & - keys (despite the fact that neither the manual or the BIOS side notes said anything about it) to adjust the frequency, but that didn't work out very well. At first, I changed it to 240 as suggested, but the computer failed to display even a BIOS screen on reboot. I checked the Dr. Debug code, which was d5, but checking in the manual, it doesn't even show that code. I then restarted it twice more, before it finally displayed the BIOS screen, which had a note about having failed to boot, and gave some options, but I went ahead and let it go to Windows. After reaching desktop, the system froze solid after several System Tray icons appeared, so I tried a forced boot. I then decided to try 220, but after an unusually long delay, it continued in what appeared to be a normal fashion, but of course Windows displayed the Boot Startup Menu. I let that go for a normal boot, but it hung at the Windows Logo screen. I then returned it back to the default value of 200, and finally got a normal boot. All of t his has somewhat discouraged me from trying that again, unless there is something more that should be done first.