beeps

I looked at the previous threads and have now bought two new motherboards and installed them into this machine and I still get the 7 Beeps, pause, seven beeps etc. I've replaced the RAM. I've cleaned everything. What else could be wrong? It never get's anything on the screen, even hooked to an...

So I purchased a acer-aspire-e5-551-t374 and I'm just trying to get it to work but when I push the power button it gives me three long beeps then two short ones. Anyone got suggestions?