I was able to play all my audio cds and now i am not able to play any. i have a toshiba satellite m305-s4910. i don't know how to fix this

How many GB or TB is your hard drive? I am sure this laptop can take 750GB or less SATA hdd. Probably you received a defective hard drive.

Either it's getting to hot or you have gotten infected, try cleaning the vent with canned air... if you can run a virus scan, Older Toshibas are notorious for getting hot...

remove the battery pack and power source. make sure nothing is plugged into the laptop. hold down on the power button for 30 seconds. then reinstall battery, plug the the adapter into a known live power source (the real reason for your problem) and power it up!

My M305-S4910 was doing the same thing. After some research, I replaced the video cable. The flickering was not as bad, but still there. I just replaced the inverter, and the pink line beneath the toolbar is now gone and so is the flickering. :-)

If you are getting numbers when you type, try fn+f11, this is for number lock which treats the keyboard as a number pad

There is a possibility that your screen backlight has malfunctioned. go get it replaced. that should solve your problem.

the bios is the operating system in the chip attached to the mother board
It is the primary system that gets the computer working (turns on all of the right electronic switches so to speak to boot up and power on)
It never needs up dating and the confusion is caused by the updating references to the operating systems ( win xp, 7 8 vista etc) which are not the bios

go to driver detective find the correct card /sound you have and click on the correct install

Recovery

• How to recover a Toshiba notebook with the HDD recovery procedure
• http://aps2.toshiba-tro.de/kb0/HTD9A02QI0000R01.htm

From CD

• http://cdgenp01.csd.toshiba.com/content/support/downloads/PMA500339010_web.pdf

You may have a hidden partition on the harddrive - if so you can recovery from there - BUT - you should also be able to create some bootable recovery DVD or CDs from the hidden partition using the toshiba recover cd creator Two ways to get to the hidden partition on Toshiba

• Press an hold the zero key and power on - this will enable the recovery menu

OR on later models

• Tap F8 as it boots and then use repair computer - from menu

• How to recover a Toshiba notebook with the HDD recovery procedure http://aps2.toshiba-tro.de/kb0/HTD9A02QI0000R01.htm

if not you can order replacement recovery cds

• https://backupmedia.toshiba.eu/landing.aspx

Remove the power strip above the keyboard and the keyboard and remove the bezel on the LCD. This will give you a clear view of the wiring leading from the screen to the motherboard. Look for a loose connection or rubbed or frayed wiring. Also, a lot of video problems are from the cable getting loose that runs from the back of the screen. This is a flat cable the fits in a socket on the back of the screen.

Here is the lcd removal duide for your laptop....

http://www.irisvista.com/tech/laptops/Toshiba-Satellite-M305/remove-screen-inverter-video-cable-1.htm