The specs of my computer (off the top of my head):
Intel D875PBZ motherboard
Pentium 4 processor @ 3.0 GHz
2 GB DDR400 SDRAM
Thermaltake TR2 500W PSU
Thermaltake Xaser III Supertower
Western Digital Caviar SATA 120 GB HDD
**Western Digital Caviar SATA 320 GB HDD
Sapphire Radeon X1600PRO 512 MB
Creative Sound Blaster X-Fi Extrememusic
Up until yesterday my computer had been working fine for the past approximately 3 years. Yesterday I installed the astrisked hard drive (not removing the other hard drive), but when I went to turn my computer back on, it did nothing. When I switch on the power supply the green indicator light on the motherboard turns on, and the blue power light on the case is on constantly; but when I hit the power button nothing happens.
I made sure the power button was still intact and it seems to be, although I haven't yet completely disassembled my case to make sure the wires are still connected to the button (though for reasons later stated I don't believe thats the problem). I tried unplugging the new hard drive, but it didn't make a difference. I verified all the front panel connectors are connected properly to the motherboard, but it didn't make a difference. I tried turning on the computer by directly shorting the power headers on the motherboard, but that didn't do a thing (which leads me to believe that the power button is not the problem).
With the green indicator light able to turn on whenever I turn on the power supply, that seems to indicate to me that the motherboard and power supply are both alright...though on the other hand I'm afraid that the motherboard might be the only remaining thing it could be. I called Thermaltake and their useless technical support, after telling me to see if the power button fell into the case, told me "I don't think it is a problem with the case or power supply" and that was that.
I think that about covers everything. Let me know if I can provide anymore information. And please don't tell me I need to replace the motherboard or another component, for that matter lol. Thanks for all of your help and 500 points to whoever can bring my baby back to life.