Within the past couple of weeks, my HP Pavillion Windows Vista 32 bit computer has been crashing on me. The monitor loses signal and I can hear sounds as if the computer is restarting, but then sometimes it doesn't restart. Usually I have to hit the power button to turn it off, then turn it back on again. One time it even had to run a system recovery and I had to restart it a couple times before Windows could start. I turned off the automatic shut down setting but apparently that didn't do the trick. Tonight there was a new symptom. When it crashed it started beeping, very long beeps, and they wouldn't stop until I unplugged the power supply (hitting the power button did no good this time). I checked the Phoenix BIOS beep codes but none of them fit.
All of my fans are running normally and temperatures are fine, although the crashes seem to happen a lot when I'm running high-memory programs. I installed a new graphics card almost a year ago, an EVGA GeForce 9600 GT 512mb, but it didn't come with a power connector. Or at least, not one that I recognize. There's a tiny 2-pin connector slot on it but I have not idea what it connects to. None of the other GeForce 9600's I've found online have the same connector. They all have 6-pins. And my Bestec 300W power supply doesn't seem to have anything that fits in it. It has one four-pin cable that is labeled with "P8" which is connected to another cable connected to the hard drive. Not sure if my graphics card's lack of a power connection has anything to do with it. Its temperature is fine. It stays at a pretty standard 60-70 C.
Everything inside seems to be running normally and quietly. Although I've been looking for people having similar problems and the most similar ones turned out to be memory card issues. Obviously it might not be memory card issues for me, but how would I go about testing my memory cards? I have two of them currently installed, both came with the computer when I bought it brand new.
I can't recall changing anything in my computer right before the crashes started happening. The last piece of hardware I installed was my graphics card and that was almost a year ago.