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When you say computer clock do you mean the LED read out on the mother board? if so the numbers you are seeing are error codes you will need the mother board manual to know what those codes mean. If you don't have the manual it's possible you can go to the mother board manufacturers web site and download one then you can look up the codes to see what the problems are. Hope this helps
when you disconnect the monitor from the PC do you see the self test appear on the screen? if you do then the monitor is working fine.
the issue is most likely that the computer's screen resolution is too high and your monitor cannot output that resolution , so it stays a blank screen or in 'sleep' mode as you described.
youd need to go into either Safe Mode when booting the system or find another monitor preferably a newer model to connect your computer to and decrease the resolution before connecting your monitor.
well it can be many things first make sure that everything in the computer is still in place. if everything is then did you do any upgrades to the computer then if not then your computers video card in broke or your mebo chip the computer is broke. does your computer come on and if so does the hard drive light just staying on or is it flashing?
Ok. I think "sleep mode" means that your monitor might not have a tight connection. Tighten all connections. Also, push the power button on your tower. When you gegt back, go to screensaver- power settings- and from there you can adjust.
Disconnect the monitor from the tower and then turn on the monitor.
If u get a msg like no input signal or check video cable then the monitor is fine. If this is the case, it could be a problem with the tower or the cable.