I have toshiba satellite L305d-s5934, Blue screen error appear and hang, when i boot or when i press F2 to enter bios... if i full out the hard disk the computer says: no bootable disk and if i press F2 to enter bios w/out a hardrive.. it will hang on Toshiba logo... is my harddrive is bad? please help me...u

maybe..

Normally when you power on your Toshiba Satellite laptop it attempts to boot the operating system installed on its hard drive.
In some instances you may want to boot the Satellite laptop from a different device, such as an operating system installation CD or a USB drive.
The boot order doesn't have to permanently be set to the hard drive.
It's possible to access the boot order before the operating system loads and change which device is set to boot first.

Turn off the Toshiba Satellite laptop.
Turn it back on immediately and wait for the "press the F2 key to enter Setup" entry to show up on the screen.
Press the "F2" key to access the Toshiba Satellite's BIOS menu.
Use the right arrow key to navigate to the BIOS tab labeled "Boot."

Scroll down to the option labeled "Boot Priority" and tap Enter.
Check through the list of devices and locate the specific device you want to use to Boot your Toshiba laptop, such as "CD-ROM," "USB" or "LAN."

Highlight the name of the device in the list and then tap Enter to make it the top boot priority.
Use the right arrow key again to scroll over to the "Exit" BIOS menu.

Tap the down arrow key to highlight the "Save and Exit" option.
Press Enter to save the new boot order and restart your Toshiba Satellite laptop.

Repeat the procedure when you want to change the boot order back to its original setting.
How to boot your Toshiba PC from CD-ROM, LAN, or diskette
http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/bulletin.jsp?soid=403623
Toshiba support
http://askiris.toshiba.com/ToshibaSupportSite/search.do?cmd=displayKC&docType=ex&bbid=bb42&url=&dialogID=111194172&stateId=1%200%20111190763

try F5

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

The laptop is not seeing any hard drive. remove the panel underneath (2 screws) and remove and refit the hard drive. If it still does not work then enter the bios by hitting the F2 key while booting and look at that page. under HDD model name and hdd serial number there should be information on the drive. If there is such info then the drive is being seen but cannot be accessed. Anyway it looks like the drive has had it. You will need to find your windows disk when you fit a new drive and reinstall windows.

Look carefully at the screen, you should see some very faint images while its booting up. IF this is the case you need to replace the inverter.

Try upgrading ur BIOS from flashdisk...

u can re-set the BIOS by removing the BIOS battery, the BIOS battery(wrist watch cell) is the size of a Dime inside the laptop, so you need to open the laptop, i suggets you visit a technician to do this.
Try doing the following also.
remove the power adaptor and remove the battery from the notebook, keep pressing the power button for 3 - 4 mins. Refit the battery / power and re-start.

Most toshiba will boot if you press F12 and a boot screen will appear . the bios is most of the time acessed through F1 or F2 try that and let me know what happens

did you try removing each stick of ram individually or the hdd then rebooting?