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Do you by chance have a monitored alarm system installed at your house?

Another possibility is a modem in a computer or fax machine that is not behaving properly.

Check to make sure it has the resistance ranges you need for your coil check (0.6 to 0.8 ohms & 12.8 to 19.2 k-ohms). An audible continuity check is nice for quickly checking fuses, but not...

In addition to running through the steps txgreasemonkey suggests (in the link above), you might check to make sure your timing belt isn't broken. Open the oil filler cap and watch the lifters while...

Does it turn over? If not and you're sure the battery is good, you should probably check the alternator next.

If it does turn over, but doesn't start, see this article (sections A & B):
...

I somehow managed to get an gallon oil bottle with used antifreeze on the shelf with the gallons of new oil. When changing the oil today, I managed to put about 1/2 cup of antifreeze in my crankcase...