When i boot up i can see by the flickering led's that it's running but nothing on screen, i have replaced the motherboard and processor, but still it won't stay on, it comes on for a second then goes off, windows log on shows for a second then goes off, it won't stay on long enough to even type my password, but if i type my password youcan see the pc working, i'am at a total loss
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From the description it is the motherboard that has major issues, sub out the ram memory one at a time and test each, If there is no change! the motherboard unfortuneately is the problem, only option is to replace board or laptop.
If your laptop appears to boot up and the hard disk LEDflashes, then the problem is probably a back light fault. This can be a faultyinverter or a faulty CCFL lamp. Please click on this link and follow myinstructions to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
Before making any decision on whether it's a hardware failure, please try and boot from a CD or DVD (recovery disc). If it does successfully boot from an external disc - and there is no flickering problem, then the hardware parts are okay. In that case, please go to this link:
http://lifehacker.com/5413223/how-to-fix-your-relatives-terrible-computer?skyline=true&s=x for more information on what to do when you can't enter into your operating system and how to fix malwares that might be causing the flickering. If you find my ideas satisfactory, please do rate me. Thanks
If it seems like you're accessing the hard drive (drive light comes on, flickers intermittently, then goes off, it's a good chance your screen is bad.
First thing to do is plug in an external monitor and start up the laptop. If it comes up with windows, you know it's the screen.
To find out if it's the backlight, or the lcd, toggle the monitor function and shine a flashlight on a slight angle to the screen. If you can faintly see what was displayed on the external monitor, then the backlight inverter is probably bad.
If the external monitor didn't come up, you're probably looking at a motherboard.
The good thing is that all of those are covered for one year under Compaq's warranty, on a new machine.
If you are able to use the external monitor, back up your data, because HP/Compaq usually reformat the harddrive. Additionally, if you've added memory, pull the cards. They want it sent back the way it came from the factory.
Does the laptop appear to boot up but the screen id blank?
Does the hard disk LED light flash?
If so you may have a faulty inverter or defective CCFL lamp. A faulty CCFL lamp may have the following symptom: Screen flashes on and off or displays reddish pink hue. Picture stays on in red and slowly be come normal. Picture flickering and/or with dim display or appear black. Picture flickers on and off. All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replace the CCFL lamp. To determine if the video card or the LCD is faulty, connect an external monitor to your laptop and power the monitor up first then the laptop, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight. Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight or a faulty inverter that supplies high voltage to the CCFL lamp. Usually the CCFL lamp fails before the inverter. The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills. Check out LCD Parts for service, parts, and DIY info Use this link to their WEB site: - www.ladparts.net
As you probably have already figured out your motherboard is running into some type of error during the boot process. Try restarting the computer and pressing the del key several times after a second or two. Can you get into the BIOS now?
The first thing I would do is to make this as basic a machine as possible: remove and add in cards (except primary video card), remove all USB components, reduce the size of your memory (RAM) and if you have multiple hard drives remove all except your boot drive. Unplug your computer, plug it back in and reboot, paying close attention to anything that is displayed on the monitor and noting any changes from before.
If nothing changes can you tell us some more about the status of the computer or what led up to this? Did you just build it; just install a new part, power problems, anything?
Let us know what you turn up and please don?t forget to rate the posting.