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After ruling out display issues, and if your computer won't turn on, try each of these steps.
Verify you have a good connection from your Mac to the wall outlet by confirming the power cord and adapter are securely connected and plugged in. To check if the wall outlet is working, plug in a lamp or other electrical device
If the wall outlet is working and you continue to have no power, try another power cord or adapter if available. If it works you may need a replacement cord or adapter. If you're using a Mac notebook, see Apple Portables: Troubleshooting MagSafe adapters for further troubleshooting with MagSafe adapters.
Disconnect all accessories that are plugged in to your computer. This includes things like printers, USB hubs, or mobile devices.
Hold down the power button for ten seconds. Then, press the power button again to see if the computer turns on.
If you recently installed memory or a drive in your Mac, make sure it's compatible, supported, and installed correctly. If possible, reinstall the original memory or drive to see if the issue persists afterwards.
No, all the hardware inside Macs is, unfortunately, proprietary. If you need wireless support, I would suggest a USB wireless adapter, or a wireless bridge. Check out Newegg.com for one of these.
I hope this helps!
If your Mac Mini does not have an Airport built in, you can purchase a USB Wireless Antennae from most any electronics store. Just make sure to check and make sure that it says it compatible with Mac OS X. If you mean how do you "set up" wireless with it, you will need an internet connection and a wireless router, which are also cheap and common.
It depends on which eMac you have. The 1/1.25 Ghz and the 1.42 ghz models have USB 2.0 so either adapter will work. The slower speed eMacs only had USB 1.1 and will not work for those types of adapters. The 700/800Mhz models will use the original AirPort card while the rest of the eMacs use the Airport Extreme cards.
Your mac mini more than likely has a DVI plug on it for a monitor. You just need a DVI to VGA adapter. You can get them at any computer store for around $7. You can get them at best buy also, but for some reason their cables and adapters are way overpriced.
If you don't have a mac mini, then your connection will be different. If that is the case then I would need to know that model of your computer. Here is a link to a random picture of a DVI port:
The only way to replace the network card is to replace the logic board in this unit, however if you are running 10.5, you can purchase an external USB to ethernet adapter at a local Apple retailer and you can hook the computer to the network through that adapter