I will admit it is my fault. Basically, the family desktop was running slow so I thought it may have been a RAM issue. So I opened the computer up so I could find out what RAM is compatible and which to buy. Anyway long story short once I put everything back and turned it on, it would power up, give 4 beeps and stay powered up but there is only a black screen. After looking it up i found it is a RAM problem so I changed the Ram around to try and find out if it was put in wrong or if one wasn't working but it still won't work, anyone got any ideas? Btw the computer is an Acer aspire m3685
Remove the memory and refit one at a time. If you have two different coloured slots ensure memory goes into slots of the same colour. ensure memory is fully inserted in the slots and the clips engage fully.