hi there phillpower, thanks for replying
. yes, the monitor cable is secured on both ends. I don't think that's the problem though, because when the problem occurs, the LED on keyboard and mouse won't turn on, too. Correct me if I'm wrong though.
as for my computer specification(it's custom build btw):
Intel core 2 quad q9550
ATI RADEON 7970
4GB of RAM
ASUS P5Q SE 2 motherboard
1000W PSU. forgot the brand name :/
everything beside the VGA is quite old, but I never had problem with this before.
so in summary, the problem is:
-PC fails to boot
-When it fails, the fan and LED inside computer case turn on like usual
-when it fails, the monitor won't display anything
-When it fails, I think it doesn't log in to Windows, because music won't play. so I doubt it's just the monitor
-when it fails, mouse and keyboard's LED won't turn on, as if there's no electricity there
-sometimes when it tries to boot, it get completely turned off(the LED inside CPU goes off, and then it tries to boot again, and fail, but LED inside is on)
-in rare case the boot is succeeded, a light shake on the case will makes everything turned off, except LED and fan inside CPU, which runs as if nothing happens
Edited by reny410, 18 October 2014 - 05:36 AM.