I wouldn't have thought there was much chance of it, but saying that, from what you have said, that PC doesn't seem to have much going. External fan failed, CPU fan sounds like it's about to seize and you have a BIOS problem... nice!

Yep doesnt seem like it does it

Im guessing there is definitely a part that needs replacing, but which part would this be or is it multiple parts?

My guess goes with the mobo at least.

Two questions. What motherboard is it, and do you hear a single beep when the PC starts?

The effects of no/low power from the battery varies between motherboard. With many PC's, the PC will display the Checksum error, and boot normally with an incorrect time and/or date. With less fortunate motherboards, PC's can become unstable and very slow without the battery, something to do with the timing of certain tasks, but it's been a while since I was taught motherboard architecture.

If your PC beeps, then the processor is likely to be ok (a little concerned about overheating issues due to those two fans being faulty - overheating). We know at a minimum you'll need to replace those two fans. Some motherboards have an auxiliary battery connection you can use incase the main battery connector is broken or corroded. If you have one of these connections, you may want to try this before replacing the motherboard. If you receive a single beep, then you won't need to replace any other parts.

The motherboard from the OP
Im not sure theres even a PC speaker in there, cant remember and can't see one unless its tucked away. How can I "create" a beep to see if there is a pc speaker. I did not hear a beep just booting now, but unsure if there is a pc speaker lol.

Oh dear. I can see the motherboard speaker onboard that one. Can you confirm it's on yours too:

Attached Images

speaker.JPG (23.7 KB, 5 views)

Please dont laugh lol for me not spotting that

It is there unfortunately. What does this mean then?

OK, so you changed the battery whilst the message was still there, but sometime after changing the CMOS battery, you also also had no video output. Just confused me weather the video problem was intermittent or occurred suddenly.

Either that PC speaker isn't working (unlikely), or that CPU is another component, which is hardly suprising based on the status of those fans. I've also checked your motherboard manual/spec, and there is no auxilery connection for your battery. This means at a minimum, your list of replacement parts includes two fans, a motherboard, and highly likely to include CPU. Ouch!