Computer blue tint

[Reed71]

So I was cleaning my pc today, and I opened the heat sink, and Cpu. Then I put them back and plugged in my video cable and turned the pc on when the monitor refused to turn on. I did some research and I put back the heat sink, took out the ram, and took out cmos battery for about 5-10 minutes. When I put everything back, I turned it on and everything worked, but the monitor is blue instead of being all colors, (also the time and date werent set when I turned on the computer), Can anyone please help!

[mdklassen]

>  ... put back the heat sink,

Did you clean off the old "heat-paste" between the bottom of the heat-sink and the top of the CPU, and apply fresh paste?  That paste is meant to make a good "seal" between the two pieces, and to transmit heat from the CPU to the heat-sink.

> took out the RAM , and took out CMOS  battery for about 5-10 minutes.

> (also the time and date were not set when I turned on the computer),

Without the battery, the date/time will "default" to some value.

Also, all of the other BIOS settings will be set to their "default" value.

> When I put everything back, I turned it on and everything worked, but the monitor is blue instead of being all colors,

Colours on the screen are "additive".  For example, mix all 3 primary colours to get "white".

If you get "purple" instead of "white", you are mixing only 2 of the 3 primary colours.

Check the video-cable's connections, at both ends, to be sure that the monitor is receiving all 3 colours.

However, if the screen is 100% "blue", that could be the default colour for your monitor, when it is *NOT* receiving *ANY*signal from the video-circuits on the motherboard.  Ouch!

When you reboot your computer, can you enter BIOS SETUP, and see enough to update the date/time?

If you cannot enter BIOS SETUP, you may have "killed" the motherboard, possibly by pushing on it with enough force, while reconnecting the heat-sink, to "flex" the motherboard, to break some of the connections.  Double ouch!

[Reed71]

I did not apply new thermal paste but the paste did really look dry. And I did not yet mess with the monitors colours, and also how do I do that exactly? Also how do I go in to BIOS setup, What should I choose?

[mdklassen]

> I did not apply new thermal paste but the heat-paste did really look dry.

It's "best practises" to remove the old paste, and apply new one, because you want a good, even, layer to avoid "hot-spots" as the heat transfers from the top of the CPU to the heat-sink.

> And I did not yet mess with the monitor's colours, and also how do I do that exactly?

Check that the "video" cable is tightly-connected into the monitor, and tightly-connected to the socket on the computer.  The three primary colours are transmitted through different wires inside that cable.

Also, can you temporarily connect the monitor to a different desktop or laptop computer, to see if it shows the proper colours?

> Also how do I go in to BIOS setup, What should I choose?

Turn the computer off.

Turn the computer on, and keep tapping the 'F2' key, until you see a message about "press <blah> to enter BIOS SETUP".

[Reed71]

Ok thank you Ill try connecting the monitor to my laptop. ANd Ill see if I can enter the bios.

[Reed71]

I can enter the bios, and also the plugs are tightly connected, I think its just the colors because when I go to the monitor menu I can see white black and yellow.

[Reed71]

I can enter the bios, and also the plugs are tightly connected, I think its just the colors because when I go to the monitor menu I can see white, black, and yellow.

[mdklassen]

>  I think its just the colors because when I go to the monitor menu I can see white, black, and yellow.

We need to verify that all 3 "primary" colours being generated by both computers are reaching the monitor.

This is different from the colours being generated "internally" by the monitor.

It could the video-cable that is the problem -- not transmitting all 3 colours.  Try a different cable.

[Reed71]

Ok ill try a different cable

[Reed71]

Its not the cable, I connected the cable to my laptop and it seemed to work fine with the monitor, It showed all three primary colors. But when I switched back to my desktop, it turned back to blue.