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Re: screen went blank
First you need to know what is wrong.. you have to check if you have power (batery ,electical conection) or you can try to reset that by taking out the batery and try again that problem can be a faulty batery ,faulty ac adapter or the big problem prosesor due to the overheating if thats the case
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If you do not hear any beeps or any hard drive activity (hold ear to case should rattle hum etc) you have either a cpu or ram problem. If it ran hot before shutting down when it works you may have burned out your cpu. If you bumped or dropped it or it overheated you maybe have a ram problem either bad ram or not seated right. If it is just dead it is possible you blew the fuses on the motherboard.
Unless you have the ability or desire to swap out the cpu and ram you need to take it to the shop or be prepared to replace it.
I would go to Compaq.s website. There you can look up youe model and see if it is one of the machines they are doing one time free repairs on. I just shipped out my wife's HP today. Seems there are issues with several compaqs and HP note books. Good Luck
Don't know why the screen is blank. Toggle the F9 key to make sure you didn't accidentally toogle off the screen.
As far as turning off the power and shutting down the computer, the old stand-by is to take out the battery and then pull the plug. The computer will power down. Replace the battery, replace the plug and then push the start button. You may have to start it up in SAFE mode since the shut down process was not the "normal' process the computer expects to follow.
I have a toshiba laptop which was unexpectedly switching off. The laptop was 2 years old. I did lots of searching online to discover this is a VERY COMMON ISSUE.
The problem is, dust blocks the heatsink. When I took my computer to pieces, I found a strip of dust half an inch (1cm) thick covering the back of the heatsink which prevented air flow. If your laptop is a couple of years old, this could be the problem. When I removed this dust, the problem disappeared.
If you are computer savvy, then try the following - if not, take it down to a computer shop!
1) Remove the 5 screws holding down the heat sink cover and processor cover. These are on the bottom of the laptop, in the centre, at the back.
2) Remove the 3 screws which hold in the heat sink in place.
3) Remove the heatsink
4) Take the dust out
a note: be careful not to get dust in the thermal paste on the cpu - unless you have replacement paste.