Help! I have had my iMac G5 fitted with new Logic Board but it doesn't work

Help! I have had my iMac G5 fitted with new Logic Board but it doesn't work
I have just had my iMac G5 First Gen 1.8Ghz fitted with a new Logic Board under the Apple Repair Extension Programme for iMacs.
I got the iMac home from the repairers and switched it on and everything was working fine for about 2 hours and then all of a sudden the Error Page came up on the Screen (with a big On/Off Switch Logo) and it said I had to shut down.
So I shut it down waited a few minutes and then tried to re-boot it but nothing happened. All that happended was the Power Light in the Right hand corner came on..but nothing else....
Help! Any ideas what to do please?

If you have an external firewire drive (it has to be firewire, USB won't boot on a Rev A), plug it in to the firewire port and turn it on, then boot your iMac and see if it shows on the screen.
Have you tried to hit the eject (up arrow, the last button on the top row of the keyboard) button when you boot, perhaps the repairers left a disc in the drive? Then try and put your install disc in.
Miriam

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