Acer Aspire 1804WSMi (hardware issue)

This Laptop when either powered by battery or through power adapter powers on, ie the power button lights up and the three fans on the underside of the Laptop start working. The light to the RW-DVD also comes on.The note book does not boot up. The screen does not come on either. After the note book has been powered on the middle fan which cools the processor stops after about 2 seconds, whereas the other two cooling fans continue working. I removed one of the panels to the back of the laptop and I have cleaned all the heatsinks to the notebook which are for processor, graphics card chipset and motherboard chipset. I also checked to see if the processor had been damaged by heat and found that there was NO OUTWARD SIGN THAT THE PROCESSOR HAD BURNED OUT. I would also like to point out after I powered on the note book I had to remove the battery and the power adapter to get the notebook to power down. I have not found any other way to power down the notebook. Could Someone please help me find out what is wrong, Thanks Ian