There were a few things i forgot to mention:
Since my CD drive has stopped working on startup when it does the checks, it stops at "Secondary Master" or something like that and i press escape to skip it, i assume it searches for the cd drive but it is not there.
My PC is situated in approimately a 1.5m x 2.5m cupboard, it gets quite dusty in here sometimes so i think that might be a problem???
Also I cannot enter the bios, whenever i press delete on startup to enter the bios my PC locks up
My Dad will probably check the connectors inside and swap over with the other PC we have this evening as he probably does not trust me.
Also if any of the above have explained the problem please let me know