Windows 7 - PC will not start after plugging PSP into USB port

Ok so here's the deal. I just plugged my PSP into my desktop and suddenly most of my inputs(save monitors) stopped working. I took the psp out out and restarted my machine, but it would not power back on.

Heres what i've done so far:

-unplugged everything; reset the bios battery;turned the psu on and off

-unplugged /replugged in all the important cables inside the box

-reset the 6-way that i plug my pc into

I have attached this psp to this machine before with no problems. After doing the steps above, I am clueless as to what could be going on. also, my mobo power light is green(implying that power IS being run to the machine).

So any ideas? please let me know any other info you might need, such as specs and whatnot if that makes any difference. As I said, normally with power issues its only a few things and I just really dont see plugging my psp into my box shorting out my on button or anything like that.

pre thanks of course

do you get any signal input from the monitor? and mobo beeps?

what happens if you unplug the power switch and just short the 2 pins with something metal? that will rule out power switch issue.

Specs would be helpful. One of us can check to see if certain components, like the motherboard, have reported issues.

Years ago I had an ASUS motherboard of the Pentium 4 vintage that just blinked out one day just as I disconnected a printer's USB cable from the back of the printer. After some testing (long story) it turned out that a current overload, probably from a static discharge travelling up the USB cable, had burned out the southbridge controller on the motherboard. Further research suggested that particular motherboard had a grounding defect in it's circuitry which would normally have shunted the charge. I RMA'd, got a new board, and all was right and good again. The lesson I took from this experience was to never connect or disconnect an externally powered USB device with the PC running. Not worth the risk for such a small investment in time regardless of the unlikeliness of it happening again.

To test your system you want to strip it all the way down:
(power off, power cord unplugged):

• Disconnect everything externally connected except the mouse and keyboard (printers, USB devices). If you are not using a wired mouse and keyboard see if you can borrow one.
• Disconnect the power and data cables from all the drives inside the computer (Hard drives, DVD/CD drives).
• Remove all the cards installed in the PCI slots including the video card. (be careful handling them and place them on a non conductive surface while testing).
• Remove all the RAM sticks (same rules as above).

Now connect the power cord and turn the PC on.

• The motherboard should start beeping. You should get a beep code that tells you there is no memory. This is good, it means the processor is functioning and the motherboard is good so far.
• Now add one stick of memory in Slot A1 and power on. More beeping: "no video card" beep code. This is good.
• Then add the video card and connect it to the monitor. You should get no beeping and you should see the BIOS screens, ending with the message that there is no boot device.

If you fail to get any expected result along the way you have to assume that the motherboard has been damaged.

One last thing to check would be to perform a CLRTC or ClearCMOS.

• Note all your current BIOS settings (does not apply in your case)
• Shut down the computer > remove the power cord.
• Remove the 3v battery.
• Move the CLRTC jumper from pins 1-2 to 2-3.
• Touch a metal part of the case and Press and Hold the reset button for approx. 30 seconds to discharge all power from the board.
• Put the CLRTC jumper back on pins 1-2.
• Replace the 3v battery > replace the power cord > boot.
• Immediately go back into BIOS and reset all your preferred settings. If the CLRTC worked you will need to reset the date and time.

Hope that helps.