Grey Apple appears then nothing

I am new to this machine - have just bought it as a bit of a project. When you switch on the machine chimes once then screen goes black and nothing. So I then boot up holding down the c key to boot from the CD/DVD ROM with the system disk - this time the screen comes up and the grey apple appears in the middle but no circular flower and the machine just hangs. I have tried booting from an external firewire drive but when I boot up and hold down the t the screen just goes blank. Any ideas ?

Hi, Stephen. Here's how to prepare a bootable CD from the AHT disk image you downloaded. I was sure there were directions for doing so included with the download, but I see now that there aren't.
To prepare the bootable AHT CD on another Mac:
1. Locate the downloaded AHT disk image file, 693-4420-A.dmg (having it right on the desktop is convenient).
2. Open Disk Utility. (The rest of these instructions assume you're using the Leopard version of DU. If you aren't, there may be minor diferences.)
3. Click the Burn icon at the top of DU's window.
4. In the dialog box that will appear, asking you to pick the disk image you want to burn to a CD, navigate to the AHT image file on your desktop and select it. Click the Burn button in the dialog box.
5. You will be prompted to insert a blank CD. Do so, wait for it to be recognized, and click Burn again.
6. The disc will be burned and when ready, it will be ejected.
Take the disc to your Powerbook. Insert it into the Powerbook's optical drive slot and simultaneously press the power button to turn the machine on. The disk should be pulled into the drive. Immediately hold down the C key. After some whirring and churning, a little "Loading..." icon should appear in the middle of the screen, followed eventually by the AHT window. If you get as far as AHT's window, choose the Extended Test and run it.
I've just done this whole procedure and successfully started my own old Tibook up with the resulting disc. The extended test series is running as I write.
If the "Loading..." icon and AHT window don't appear, there's a hardware problem — possibly just a bad optical drive or possibly worse. The machine may or may not actually be dead, but at this late date it isn't worth repairing with a new drive or anything else.
Here's one other thing to try: start up in Single User Mode and run fsck. This performs disk directory repairs equivalent to those performed by Disk Utility's "Repair Disk" routine, without the need to start up from a CD or DVD. It won't help if there's a hardware problem, but if your internal hard drive's directory is damaged, this may sort it out. Instructions are here:
http://support.apple.com/kb/TS1417
Message was edited by: eww

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