Toshiba Satellite P855-S5312 Support Question
Toshiba Satellite P855-S5312 Support Question
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Question posted by jerrysu on April 23rd, 2014
Satellite P855-s5312 Wont Boot
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Current Answers
Answer #1: Posted by freginold on July 16th, 2014 6:15 PM
freginold
Member since:
December 20th, 2011 Points: 23,253,885
Member since:
December 20th, 2011 Points: 23,253,885
Often when a laptop won't power on, it's because of one of four things: the battery, the battery charger/AC adapter, the power board/battery charging board (if the laptop has one), or the motherboard.
You can attempt to rule out the battery by attaching the AC adapter and trying to turn the laptop on. If the laptop turns on when on AC power but won't turn on with the battery, then one of two things is happening: either the battery is bad, or the charger is bad and the battery has run down. If the laptop won't turn on with or without the AC adapter plugged in, then the battery is not the problem. If your AC adapter has an LED on it, you can often tell if the adapter isn't working because the LED won't light up. (However, just because the LED does come on doesn't mean the adapter is working as it should.)
If it doesn't seem to be either the charger/adapter or the battery, then you're probably looking at either the power board or motherboard. If you are comfortable taking the laptop apart, you might want to try replacing the power board, which is the board that the charger plugs into. Amazon.com sells power boards (also sometimes called power jack boards) for many laptops for between $15 and $30.
The motherboard is a more expensive option to replace, so a good rule of thumb is to try the less expensive parts first. If it still won't power on, you may have a bad motherboard, in which case it might be cheaper to get a new laptop than have the motherboard repaired or replaced.
You can attempt to rule out the battery by attaching the AC adapter and trying to turn the laptop on. If the laptop turns on when on AC power but won't turn on with the battery, then one of two things is happening: either the battery is bad, or the charger is bad and the battery has run down. If the laptop won't turn on with or without the AC adapter plugged in, then the battery is not the problem. If your AC adapter has an LED on it, you can often tell if the adapter isn't working because the LED won't light up. (However, just because the LED does come on doesn't mean the adapter is working as it should.)
If it doesn't seem to be either the charger/adapter or the battery, then you're probably looking at either the power board or motherboard. If you are comfortable taking the laptop apart, you might want to try replacing the power board, which is the board that the charger plugs into. Amazon.com sells power boards (also sometimes called power jack boards) for many laptops for between $15 and $30.
The motherboard is a more expensive option to replace, so a good rule of thumb is to try the less expensive parts first. If it still won't power on, you may have a bad motherboard, in which case it might be cheaper to get a new laptop than have the motherboard repaired or replaced.
Related Toshiba Satellite P855-S5312 Manual Pages
User Guide - Page 1
... 133 in this Web site, you need assistance: Technical support is available online at Toshiba's Web site at support.toshiba.com. GMAD00332010 09/12 Satellite®/Satellite Pro® P800 Series User's Guide
If you will find answers for many commonly asked technical questions plus many downloadable software drivers, BIOS updates, and...
User Guide - Page 2
... SYSTEMS OR REMOVABLE STORAGE MEDIA ARISING OUT OF OR RESULTING FROM THE USE OF THE PRODUCT, EVEN IF ADVISED OF THE POSSIBILITY THEREOF. Model: Satellite®/Satellite Pro® P800 Series
Recordable and/or ReWritable Drive(s) and Associated Software Warranty
The computer system you must read and follow all the data stored...
User Guide - Page 5
... environments, the use of Wireless LAN may for example include:
❖ Using the Wireless LAN equipment on the use of interference to co-channel Mobile Satellite systems.
High power radars are uncertain of the policy that operate with and/or damage this product to 5.25 GHz frequency range. These radar stations...
User Guide - Page 7
... this product to be used indoors for frequency range 5.15 GHz to 5.25 GHz to reduce the potential for harmful interference to co-channel Mobile Satellite systems. High power radars are allocated as primary users of the 5.25 GHz to 5.35 GHz and 5.65 GHz to protect the quality of the...
User Guide - Page 18
... vary.) Industry Canada requires this product to be exposed to laser light or other safety hazards, resulting in the 5.15 GHz to co-channel Mobile Satellite systems. High power radars are allocated as a CLASS 1 LASER PRODUCT. These radar stations can cause interference with and/or damage this model properly, read the...
User Guide - Page 20
... word mark and logos are owned by a consumer engaged in personal and non-commercial activity or was encoded by the Bluetooth SIG, Inc.
20
Trademarks
Satellite, Satellite Pro, and eco Utility are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.
and any other product...
User Guide - Page 61
The Boot menu displays.
4 Using the arrow keys, select the DVD option or the USB Flash option, depending on which type of media you are on a USB ...
User Guide - Page 122
...operating system. General tab options
The System Settings screen may have the following tabs:
❖ Boot-Allows you to change various default settings for the BIOS to initialize, using after starting in ... the sequence in which your computer searches the drives for the operating system
❖ Boot Speed-Reduces the time needed for the built-in display
NOTE
When the computer restarts,...
User Guide - Page 137
...Startup options to fix problems
If the operating system fails to start properly twice, the Windows® Boot menu will be changed back to fix the problem. There are retained ❖ Apps you may...need to your desktop For more information, see "Refresh your PC" on page 61. To enter the Boot menu manually: 1 Press Ctrl, Alt, and Del simultaneously (once). 2 Press the Power button in the...
User Guide - Page 138
... menu were available by the user.
Restore points are installed during the Windows® boot process:
❖ Enable low resolution video mode
Restarts Windows® using your display ...
❖ Enable debugging mode Starts Windows® in an advanced troubleshooting mode
❖ Enable boot logging
Creates a file that lists all the drivers that are created:
❖ When new hardware...
User Guide - Page 159
... Canada Europe Japan Mexico and all sources.
❖ Review the troubleshooting information in this chapter and are running a program, consult the program's documentation for Toshiba laptop users Your dealer is important to investigate all of Latin America Toshiba USA Self-Service support web site Community discussion forums for troubleshooting suggestions.
Contacting...
User Guide - Page 170
... central processing unit (CPU) communicates with other parts of the computer. The term "boot" originates from one device to locate the startup files. Under the default startup sequence...(BIOS)-See BIOS.
bus-An electrical circuit that loads and initializes the operating system.
boot priority (startup sequence)-The order in read-only memory (ROM), containing the information the ...
User Guide - Page 178
.... Compare ROM.
The general classes of memory
is used for your computer.
program-A set of instructions that information in a cable for "picture element." reboot-See boot, restart. Plug and Play-Generally, refers to the computer's ability to automatically configure itself automatically to a network or a peripheral device. pointer-An icon (usually an...
User Guide - Page 179
.... Sleep-A feature of some operation on again. software-See program. Solid state drives hold a large amount of information and are used
to a network. See also boot. Non-volatile here means that information in ROM remains whether or not the computer is expressed as opposed to a hard disk (see also hard disk...
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