Desktop computer boot display black screen prompt no signal what should I do?

Desktop computer boot display black screen prompt no signal what should I do? desktop computer power does not turn on the black screen for memory card is not bad contact, fault phenomenon for computer host power and can hear the cooling fan operation of the sound monitor display no signal after the black screen, if this is the case can refer to the resolution of this article.

1, time is long or there is a period of time, the memory bar will be loose, resulting in no signal display.

2, the memory is loose, go to the mainframe inside to take him out, and then use a dry towel to wipe a towel, then put him back, remember to press back OH.