PowerPC G5 1.6GHz not starting up..please help!

Hello everyone
I should firstly add that I have been having display trouble for a few years now (only showing video after a few restarts), so this may have something to do with what happened the other day, which is as follows:
I was online but on the phone to a friend, then all of a sudden the fans of my PowerPC G5 started going wild, as if the room temperature rapidly increased (I've had this issue before too). The screen cursor from my tablet pen (little arrow) was frozen (don't recall this happening for a long time), so the only thing I could do was a forced restart from the main power button at the front of the G5. It did start up again, but with messed up video (as if I pulled the power cable out of a TV). I thought not to worry, as I usually have video issues and a few restarts usually sorts it out, however the next forced restart produced no video (just a black screen) and more to my concern, no white light or start up chime! Following restarts have been the same.
There is a start up sound when I press the power buttton (I think maybe some brief fans as well), but no light or that power on chime noise. My feeling is that I now have the original video issues combined with a failure of somekind! Please help as I am really worried that this might be something serious.
Does this sound fixable to you guys??
Thanks for reading,
Adam

Hello BDAqua, and thanks for your reply.
Interesting you mention dust, as I have been thinking of that, my G5 is not totally covered at the back, where the PCI slots are. I'll open it up and have a look. It'll be great if that resolves it!
Apart from that, I have some updates. I disconnected everything from my G5, just plugged my G5 into a wall socket (previously it was plugged into an extension). Pressed the power on button, first time it started the same way, no chime or light, but the second time it started with the chime and light! Then it kept on starting like this so I had a go at connecting the cinema display back, to see if I could get an occasional video start up.
On the first power up, the light and chime worked, but no video on the display, just black. On the second attempt, the problem returned with no light or chime (or video). I disconnected the display again and powered up, still no chime or light. Could connecting the display be making matters worse?
Next morning, with display disconnected, G5 starts again with chime and light (as if it recovered from display cable infection).
As there was occasionally no light/chime, even with the display disconnected, I'm not sure where the problem is rooted. I read an article saying that I should change my video card, if video only comes on after a few restarts (problem I've had for years prior to these new issues). Could it be that an issue between video card and display, when left unresolved for years, has now begun to affect the general start up of my G5? The article said if I have card model ATY,RV350, I may need to replace it, and that's what I have. I'm wondering if this is the root cause, but I'll have a look at the dust, and maybe try resetting PRAM, NVRAM and PMU.
Thanks for your help.

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