Faulty RAM?

Hello guys.
mu issue is more less common,at my home the electricity is neva stable..its on and of most times...so I woudnt say I used the switch button to turn my pc off.
but a lito while ago,I have this problem of checksum error default loading..poping on the screen,my mouse, keybord not rensponding with some strange noise..(bips) its wen I visited this site read about som tips on the CMOS battery changing ,jumper settings and re-set , but it neva worked so I went for repair it was ok..they tod mi the noise was the one of the RAM was faulty.but wen I went home I tried the other RAM teking off the current RAM one the pc replaced with the one he clamed was faulty was ok..that ment the RAM was finebut the RAM slot was nt not ok...nw same thing has happened and am prity confused...
 
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