My computer wont let me into the bios when i start it up all i get is a blank screen i dont even get the bit where it tells you what buttons you press to get to the boot menu my screen is just blank

What is the model of this laptop?

reboot it in safe mode and if it shows desktop restart once again
booting in safemode hold F8 while restarting your machine choose start window in safe mode and hit enter
best of luck
if problem wont solve let me know please i will tell you another way

your computer your laptop will just shut itself down and get a black screen unexpectedly, which is due to: power overload in the AC adapter, overheated processor / clogged fan, overheated battery, pushing the power button, Windows telling it to, the BIOS telling it to, loose wires (especially the power cord), or intermittent short circuits. The most common problem is cooling. the battery should be removed from the laptop and allowed to cool to room temperature before attempting to use again.

you need to change the lcd inverter card of your note book

This has happened to my computer twice, the computer starts up butnothing appears on the screen. Both times it was a corrupted BIOS thatneeded to be updated - if you follow the instructions here it is asimple fix. If it is too complicated then point out the link to atechie friend and get them to do it for you:
http://eric.chromick.com/aa1/aspire-one-black-screen-of-death/

You will find useful information and BIOS downloads here:

Notebook Does Not Startup or Boot Displaying a Blank Screen

BIOS update

Try the first link first. Update the BIOS after carefully reading all the instructions.

Acer Aspire One BIOS Recovery The AA1 has a built-in BIOS recovery routine, making it possible to flash the BIOS even if the system doesn't boot anymore. It's only meant for emergencies and may void your warranty, so use at your own risk.

Follow every step carefully!

First format an USB stick with FAT.

Download the latest BIOS, and put both FLASHIT.EXE and the BIOS file in the root directory of the stick. Rename the BIOS file to ZG5IA32.FD, that's important. Do not remove the USB stick.

Turn the AA1 off, make sure both battery and AC adapter are connected. Press Fn+Esc, keep it pressed and press the power button to turn the AA1 on. Release Fn+Esc after a few seconds, the power button will be blinking. Press the power button once. The AA1 will now initiate the BIOS flash, do not interrupt it under any circumstances. After a while the power button will stop blinking, and the AA1 will reboot shortly after. Wait patiently.

The BIOS has been flashed and all settings reset to default.

If for some reason you made a mistake during the procedure and it doesn't reboot by itself wait 5 minutes before turning it off, just to be safe that it isn't still flashing the BIOS.

ugghhh i dont know but i have a question. my computer wont recognize the sansa fuze? UGGHH i am so mad plz someone help me..... i really need help... when i plus it into the computer the screen where it shows 'open to vie files' 'play in windows media' and stuff wont work...it just donesnt come up. its like the USB is not even connected? but it is and the port is working fine... i tried all of the ports i have? it just wont work. i even tried dowonlaoding the music store witht he CD but it still wont work....i am so madd... plz can someone help me in step by step help? Also i checked online on sansa.com but its like press and hold the rewind button to go to USB mode and click sumthin but mine wont ven do anyhting when i keep it pressed... plz help me..... thnxz

This may be an unrecoverable issue. The bios are very touchy, it's the built in programming that allows the computer to work, never do a bios update directly from the internet, download, save, then run. If the loss of power corrupted the bios, in most cases they cannot be recovered, and since the bios is what tells the machine to power and run, cannot be reloaded. You will probably need to replace the motherboard. Take it to a tech (Bestbuy as a last resort), tell them what happened and see if he/she can recover it. Techs have diagnostic discs for this, however and again, if it won't power due to corrupt bios, the disc won't do any good and they'll probably tell you the same, motherboard replacement. I hope I'm wrong on this and it's just something simple.

to restart in BIOS in sony vaio press F2 or F3