Hello, I've inherited a PowerPC G5 desktop mac from my work predecessor, running OSX 10.3.9 with 512Mb DDR SDRAM.. and after 3 months of it working just fine, this morning, it switches on but doesn't chime. It also never makes it to the log-in screen and the cd rom drive does not react.
After a while (5mins or so) the fans come on full pelt

.
The only response i've managed to get from it, to my tries of the Command etc functions is to get it to bring up two icons on screen when i start the Mac up but with the Option key pressed.
The icons, on a light-blue-ish background resembles a browser's 'refresh' icon and then there's one that resembles a 'forward' or 'next' button.
Neither can be clicked on as the mouse nor keyboard responds to any other key presses.
Seriously stuck,
Andrew (listening to the fans)