Whats the problem with my pc, i a have an ibm pc, it always hangs up?

there was an pop out error messages upon starting, the keyboard sometimes work sometimes did not, the keyboard is working i know because i test it on another computer, some other error messages is memory configuration, i cleaned the memory slot and the memory itself, it still doesn't works what do you think,... show more there was an pop out error messages upon starting, the keyboard sometimes work sometimes did not, the keyboard is working i know because i test it on another computer, some other error messages is memory configuration, i cleaned the memory slot and the memory itself, it still doesn't works what do you think, its the memory or the processor?? help pls.
Update: it can no longer go to devices because upon starting it cant seem to go to even on cmos setup.
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