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Aug 25, 2016 11:24 AM in response to slug40by K Shaffer,The sounds a Mac may make on startup, are covered in this article:
• About Mac computer startup tones - Apple Support
Learn about the different sounds your computer makes when it starts up and what they mean.
Mac computers can produce several sounds when starting up.
Your Mac should produce the familiar single tone on start up.
If you hear one of these tones, it might mean there's a problem with your computer:
- 1 tone, repeating every 5 seconds: This indicates no RAM is installed.
- 3 successive tones, a 5 second pause (repeating): This indicates RAM does not pass a data integrity check.
- 1 long tone while holding down the power button: Indicates an EFI ROM update is in progress on a computer manufactured before 2012.
- 3 long tones, 3 short tones, 3 long tones: Indicates EFI ROM corruption is detected and the computer is in EFI ROM recovery mode.
If you need to restore the EFI ROM on certain Mac computers produced before 2008, you'll
need to use a Firmware Restoration CD to restore the EFI ROM. Search Apple Downloads
for the right CD image for your computer.
Newer computers automatically recover from a corrupted ROM; when this occurs, a progress
bar appears on the screen during ROM recovery mode. Do not disturb the machine while the
ROM recovery is taking place. It will restart back into OS X when recovery is complete.
More:
Pressing and holding keys when the startup tone sounds can make your Mac function in different ways.
To learn more, see Startup key combinations for Mac.
If your computer is the iMac Mid-2007 24-inch model -- suggested by your name in your post:
• iMac 24-inch mid 2007 memory specs - from http://mactracker.ca database app:
Maximum Memory 6.0 GB (Actual) 4.0 GB (Apple)
Memory Slots 2 - 200-pin PC2-5300 (667MHz) DDR2 SO-DIMM
Minimum Speed --
Interleaving Support Yes
Upgrade Instructions How to remove or install memory - see iMac instructions in this link:
• Install memory in an iMac - Apple Support
Hopefully your iMac isn't sickly.
Good luck!