I recieve 2 seperate Beep codes on powerup 1 long - 2 short, followed by another 2 short beeps.
Video chip issue, this may also be caused by a bad PSU as a result of it not being able to provide good, stable or adequate power to the video chip or add on video card.
I have removed RAM/video/sound at seperately to deduce whether they were an issue, but nothing changes
Having researched the Acer Extensa E210 I have found that it has an integrated video chip (ATI Radeon X1200) and that it also has a pci-e x16 slot for an add on video card, add this to the fact that you have said above that you removed amongst other things video
suggests that you have upgraded to an add on video card is this correct?
If it is did you also upgrade the stock 250W PSU, if so what to, make and model please, a 250W PSU will just about power an integrated video chip but will struggle with even the lowest of spec add on GFX card.