Acer projector error beeps

[Hacksawbob]

Hi I have an Acer P7280 It had a bulb replaced in October after the unit was turning off after a short time. the problem re-occurred, Unusual we thought after such a short time but we have purchased a replacement bulb and fitted. The projector gives 5 X 2 double beeps, shows a blue power light but no fans or light I have taken a look here but I cant find anything relevant (there is no sliding cover)

ftp://213.147.98.168/Servisne_upute/Acer/P7270i_P7280%20Refresh%20V3.0(DDP%203020-USB,%2036.89K01G001)Service%20Manual.pdf

Any ideas where to go with this?

[Hacksawbob]

Acer reckon the motherboard has gone... time for out of warranty repair actually £55 for courier and assessment isn't too bad.