Why my computer cannot turn on?

When I press the power button, it only have a "reboot sound", but I can't see anything on the screen, also the green light is not on, only the orange light is on, anyone know what's the problem on my PC?
mawinghoAsked:
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itmonitorCommented:
depending on the manufacture of the computer it may be two main things (since you are only getting an amber light) and that would be either power supply or motherboard.  With the amber light your post isn't passing and my best guess would be the one of these two issues.  To rule out the power supply try putting another one in if you have an extra.
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pzozulkaCommented:
Try this for perhaps a quick fix. Unplug everything from the power outlet, and plug it back in.
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kosmoraiosCommented:
Also make sure your voltage selection switch on your power supply is set to the correct voltage. I've seen this many times when the switch is accidentally moved.
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mawinghoAuthor Commented:
switch??? u mena the voltage switch?
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dineeshCommented:
hi,

Could be 3 reasons:

1. RAM - Remove clean the RAM pins with tissue and insert again
2. Processor - Remove and insert again

please do the above if you have experience in handling the hardware, else ask someone who knows the hardware to do it.

3rd reason - if you have a graphic card - remove and re insert the same
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kosmoraiosCommented:
Yes, the voltage selector switch on the back of the power supply.
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WakeupSpecialist 1Commented:
I would tend to agree that it could be the power supply or motherboard.  Especially if this is a computer that was working before.  And if you are getting no post beeps.  You may want to check to see if the Capacitors on your motherboard are not buldging or leaking.

That could also cause this problem.
They would look something like this:
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.pcstats.com/articleview.cfm?articleID=195
http://www.auroracomputer.ca/bad_capacitors.htm
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nobusCommented:
i suggest testing with the minimum setup - disconnect also all peripherals and network cables :
motherboard + cpu + 1 ram stick, video card, power supply
on boot, do you have a display?
if NO it is one of the connected, swap ram, Power supply, video card - leaving only motherboard and cpu
if Yes, add devices till the problem shows

you can also check the motherboard for bad capacitors as shown here :   www.badcaps.net
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