EMac will not turn on after downloading updates

Hey everyone,
Yesterday my wife downloaded some updates for her eMac and now we can't get it to turn on. I've checked the power supply and it is there. When we push the power button it sounds like the monitor is trying to turn on but nothing else happens. Any thoughts? Thanks for your time

mtntrekker30,
Welcome to the Apple Discussions!
I'd suggest trying a double approach as one operation: reset the power supply and reset OpenFirmware and NVRAM. To do this, with the computer off, unplug everything except the Apple keyboard and mouse, including pulling the power cord from the side of the eMac. This removes the trickle current drawn by modern electronics even when nominally off. Wait 15+ minutes, then reattach the power cord only.
Next, press the power button, then hold down the command-option-o-f keys until you see the message "Welcome to Open Firmware" (black text on a white screen with a command line prompt at the bottom). Type in the following commands and press return after each (case sensitive, no spaces):
reset-nvram
set-defaults
reset-all
The Mac should restart after reset-all (if it doesn't, type mac-boot and press Return)
Reesetting NVRAM can be thought of as a superset of resetting PRAM; you may need to change some of your settings in System Preferences afterwards (refer to Mac OS X: What's stored in PRAM?)
Be aware that if this works, the startup will take significantly longer than usual at the white screen/Apple logo/spinning wheel stage. Part of this will be due to the updates, most will be due to the system running a silent version of Disk Utility's Repair Disk function before continuing to the OS X startup screen. Give it plenty of time.

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