Refixed all cables connecting to monitor. then start,
if you are sure that the monitor is ok, then these are only things to test
check memory and fixed it very well, then start, if the same problem,
check Video card and fixed it very well, then start, if same problem,
examine processor and motherboard. by doing this, you should remove the memory and start the system. if produces long beep means memory and processors are good.
there is no other thing to examine on this matter.
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