If your laptop appears to boot up and the hard disk LED flashes, then the problem is probably a back light fault. This can be a faulty inverter or a faulty CCFL lamp. Please click on this link and follow my instructions to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
SOURCE: Please help me! I've forgotten
just remove the back up battery inside your laptop. find inside or sometimes it has small window cover with small screw to lock or clip look it under or side the laptop.
SOURCE: hp probook 4510s wireless isn't working
you will need to open up your network connections Make sure you Ethernet is enabled in bios restart your computer during the boot up process you will see on your screen a certain key to press to enter set up (BIOS) press and hold that key to enter bios using arrow keys scroll to intergrated peripherals click start type cmd press enter you will be in DOS mode type in ipconfig press enter you will see all of your internet connection details or type in your default gateway adress into your internet search should read something like 10.0.0.138 to get an inertnet connection
click start control panel network connections this may vary depending on your operating system look for local area connection if you see a red X or a yellow exclamation or question mark ! ?
you will need to update or install the driver or it could be firewalled
click start control panel administration tools computer management device manager scroll to network adapters should see a yellow question mark? right click install drivers
the driver might be on the disc supplied by your ISP internet service provider
or the motherboard disc or you might download one if you dont have on a disk
look for SiS On Chip Pci Device press enter scroll to SiS 10/100m press enter make sure its enabled
to create the menu tab on your homepage right click in the top toolbar you should see a number of toolbar options select the menu tab which will add File Edit View Favorites Tools and Help
click on the tools at the bottom of the drop down list will be internet options or
click start control panel internet options you will see a home page box To Create Page Tabs type
each adress on its own line (type in google.com) or your preferred home page and browser
below that will be change search defaults click on settings you will see all search providers you
have if dont need any of them you can disable or remove them
hope it helps
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