My laptop was working just fine yesterday afternoon. Last night, I turned it on and got white lines running the screen, the log on sound, and then a blank black screen. The battery is charged, and I tried turning it on while plugged in and unplugged from the wall. I tried using F8 for safe mode as well, and just get a blank screen. When I go to turn it off by pressing the power button, the blank screen goes away and I can see my desktop with all of my icons, and then it powers down. Any ideas?
HP has identified a issue with the DV6000Z and monitor. I just reported the same problem to HP and even though off warranty, they will fix free. Power up of DV6000Z you will get 3 beeps and no monitor display. External monitor does not work either. This is a known issue woth the DV6000Z.
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Can you check the function buttons and make sure the primary display is set to show the output on the laptop. Try repairing your OS. If not then re-install the os. As you are saying till the time windows gets loaded, all works fine so it seems the issue isn't really the hardware.
If the inverter board or the back light behind the screen were bad your display would be blank, "but windows would be visible barely" the white screen indicates a bad LCD and must be changed. It is also possible the video cable from the motherboard to the screen has come loose and will need to be reseated back into place to fix it.
I'm a pro laptop repair/rebuild tech. If you own an external regular computer monitor or even a friend who does, connect the laptop to the external monitor and power it on. Your Toshiba will have an F key with a little icon figure of a monitor on it. Hold down the fn key and press that F key to transfer the laptop display signal to the external monitor.
If the external monitor shows your normal laptop screen as it would usually display, you have a bad laptop LCD and some other (as yet) undetermined problem. If the external monitor is black just like the laptop, then yout video/graphics card has failed and since it's closely associated with power up issues at the beginning of the startup cycle, is interfering with the laptop's ability to run the operating system because it never gets that far.
From what you've described, you're going to have a choice of sending the laptop to a motherboard repair service (if you go to eBay and type "Motherboard Repair Laptop" in the search window you'll see many choices) for a price between $100 and $200 or need to start shopping for new laptop.
Are you running on battery or AC? Try using the power cord, remove the battery and see if it continues. I have seen a battery that is on its last legs do some weird things to a computer. Also, check your power management setting. Control panel, power, and set the computer to "always on" just to see if it could be a power management setting. If none of this works, i would back up all your files, and try to reload win xp from scratch.
I had this exact problem with a customers computer andi found out that HP put faulty motherboards in the DV6000, DV9000, Compaq V6000 Series Computers. Thankfully HP fixing all computers for free and extending the warranty even if the warranty has expired they will ship you a box and you ship it off and they fix it at no cost. the turn around period is about 7 days.
The problem is with the inverter or screen. Since you changed the inverter, the screen is the only thing left. The cable will not cause this, it will cause the screen to blank out completely. You need to replace the screen.