No Beep, High Pitch Sound, No Keyboard Light

My win xp sp2 system was working (for years, unchanged) one day, next day (after normal system shutdown via start button for night) it won't start. During cold start, the ps seems to hesitate (~10-20 seconds) and make a bit of a high pitch sound, then the power 'comes on. '

- Video, memory out = no beeps. - Video out, memory in = no beeps. - Video in, memory out = no beeps. - Video in, memory in = no beeps. When system has power:
- No keyboard light. - No mouse light. - Can hear hd spinning
- Case fans come on
- Cpu fan comes on
- Dvd has power (tray in/out). I even tried unplugging the cpu fan for a brief moment. It heated up, so i thought this indicated the cpu isn't dead. I've replaced (with new), the video card and the mobo, thinking it was one and then the other during my attempt at diagnosing. I'm venturing to guess that my ps is failing (although not total failure yet). Sound like a reasonable explanation?

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