PC cannot boot up

Hi, The PC(Win7) was running a little longer time. Then it cannot boot up. After powering on, I can hear it is running, but screen is black all the time. I think it may be RAM or other parts have some issue. Any one can give some suggestion ? Thank you.
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Scott CSenior EngineerCommented:
Do you see anything on the screen when you turn it on?

Try disconnecting the hard drive, optical drive and remove all RAM except for one stick.

Try again.

Swap out a stick of RAM and try again.

It could be anything that is keeping the machine from booting...RAM, HD, optical drive, MB, power supply, etc.

I've even seen it where a fried modem would keep a PC from booting.

You'll have to test the parts individually as best as you can to narrow down the issue.
Aland CoonsSystems EngineerCommented:
Since you cannot see anything on the screen start by testing the screen and connecting cables with another PC.  You should see a logo on power up (e.g. Acer) followed by a logo or startup screen from your PC/mobo (e.g. Lenovo).

In addition to above suggestions: If you are using an add-in video card (gaming, graphics) try removing it and using on board video.

The initial startup of a computer (BIOS) is called POST. Video, memory, and CPU are most likely culprits but I've seen bad HDD and CD/DVD drives keep a machine from turning on. If you want to look for more information and suggestion search for "machine will not POST".
Paul MacDonaldDirector, Information SystemsCommented:
Does the machine beep?  That is, are there any Power On Self Test codes?  

If so, let us know how many beeps, and whether they are long or short.  

If not, it's likely a motherboard, RAM, or CPU issue.
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noxchoGlobal Support CoordinatorCommented:
Is this a PC or laptop? If it is PC then check if the cable from system to display is properly connected. You can also turn off the PC. Remove the motherboard battery and after 5 minutes install it back and try to start the PC.
post the model of this pc plse
you can try the minimum setup :
http://www.experts-exchange.com/Hardware/Components/Motherboards/A_1945.html                  (Short-overview-of-how-to-troubleshoot-bad-hardware-when-a-pc-does-not-post)

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Paul MacDonaldDirector, Information SystemsCommented:
Thank you for the points, but could you please post the resolution to this problem?  It might help someone else with the same symptoms...
eemoonAuthor Commented:
Thank you all. As I was too busy to handle this issue. so I had to close the post at that moment though I did not solve this issue.
The laptop has two stick of RAM and one harddrive. Just now I removed them one by one and then powered on. But I have not found any difference before and after the removal. I did not hear any beep etc except fan noise. The screen is always black without any signal. Any one can give me some suggestion ? Thank you

Another thing that I had not told is that the laptop had been running for long time without shutting down. I do not know if this is a reason and which part is easily damaged.
here my laptop troubleshooting guide, i hope it helps you :
- remove all external devices
-you can disable devices from BIOS to test (sound, lan, etc..)
- if no display - test with an external monitor
- test if it runs from battery alone, or from AC alone
- test also with a known good battery !
***some laptops have a reset button - if you have one use it!
- remove battery and AC adaptor, hold power button for 20 sec, connect AC and reboot --> any display ? if NO -->
- disconnect all disk and cd drives, battery , and other cards and peripherals, leave only 1 ram stick
- boot -->any display ?
-if you can access the bios battery, remove the battery, AC, and bios battery for a minute to reset the bios
or test it, it should read 3 V
*** you can test the disk on another pc, if you like !

===>>you can test if the mobo works outside the casing, connected to power and external video  !

you can also remove and reseat the video plug - it sometimes comes loose
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