A system that has stopped dead with no bleeps or boinks or anything is usually a dead power supply.
If the fan does not spin up on the power supply that's a point in the right direction.
If it's soft-power controlled, (The power button goes to the mother board, not the PSU) and there is no LED or other diagnostic on the board to show power at standby there is a less techy diagnostic to check for the power supply:
The power supplies are your basic electric coils and are often packed in oil and plastic. When they fail spectacularly, this is what melts or vaporizes and produces the dreaded "magic smoke." Even your minor power-supple blow-outs involve some shorting in this medium or blowing a heavy capacitor on the control board or something. So... burnt oil/plastic.
Get your nose to the fan grill of the power supply and take a good sniff. It's a hard scent to describe, but it's somewhere down between used motor oil and burnt cooking oil in a frying pan. If the smell is decently present, you've fried a power supply.
If the power supply is fried, and more than a few years old, it was likely just the jostling of the case as you worked that finally caused it to go. Check that cables aren't backwards or mis-wired, of course, but in all likelihood you just need a new PSU from Fry's and the rest is OK.
One other silly thing to check. Most PSU's have a 110/220 switch on the back. Did you accidentally bump it to 220 and it's now intelligently ignoring the 110 power?
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If the fan does not spin up on the power supply that's a point in the right direction.
If it's soft-power controlled, (The power button goes to the mother board, not the PSU) and there is no LED or other diagnostic on the board to show power at standby there is a less techy diagnostic to check for the power supply:
The power supplies are your basic electric coils and are often packed in oil and plastic. When they fail spectacularly, this is what melts or vaporizes and produces the dreaded "magic smoke." Even your minor power-supple blow-outs involve some shorting in this medium or blowing a heavy capacitor on the control board or something. So... burnt oil/plastic.
Get your nose to the fan grill of the power supply and take a good sniff. It's a hard scent to describe, but it's somewhere down between used motor oil and burnt cooking oil in a frying pan. If the smell is decently present, you've fried a power supply.
If the power supply is fried, and more than a few years old, it was likely just the jostling of the case as you worked that finally caused it to go. Check that cables aren't backwards or mis-wired, of course, but in all likelihood you just need a new PSU from Fry's and the rest is OK.
One other silly thing to check. Most PSU's have a 110/220 switch on the back. Did you accidentally bump it to 220 and it's now intelligently ignoring the 110 power?
Here's hoping it's simple.