Toshiba a215-s5837 Well am Technison who has open the toshiba a215 s5837 notebook, and my question is, under the key board there is 2 slots. one is mark 3G/HD on it and the othere has BT. what goes there at the slot that marks 3G/HD,what chip , is it memor,and were can i get the chip to go there.???

I would assume this may have Windows XP or 7, see if you can find the recovery disk for your machine. One of the things you can try is use the CD as your boot disk (you may need to enter the BIOS or SETUP to change the boot order...there will be a key to hit when you see the Toshiba splash screen when you first boot the machine...it will say press "<some key here>" to enter setup.)
Once you boot from the disk I would try getting to a command prompt and running the following command: chkdsk c: /f /r

This will scan and repair any bad sectors on your hard drive and if they can be repaired it may make your machine bootable again. If they cannot be repaired, it may be that your hard drive is dying. Either way...if you get into the machine (even from the boot disk) if you can see the drive, I'd recommend backing up whatever files you can, because if the drive dies, you will lose your data

if u be able to check the chips VGA and South-bridge, while the board on/working without casing u can fell by touch the chips surface if its hot or warm that mean chips working fine, if not that is make the display blank, if its fine just try to reset hardware Bios.. Good Luck

Storage Controller / Serial ATA Interface Serial ATA-150

SATA

Well NO it only has ONE for the existing HDD. If you need another drive, it must be USB, or FireWire.

does the screen show anything or is it blank?

Yes, replace entire thing. It's really a membrane key anyway. NO contact to clean..

Master Reset for what? Bios or user account?

You may have a bad battery. Many times laptops will not work if the battery is faulty. The first step would be to replace the battery with a new one.

Second Step: If the battery is working, then you may have a faulty AC power supply. It may be enough power being brought to power up the LCD light, but not the computer.

Third Step: Yoru mother board circuitry could be bad in the sense that some circuits are broken or the power conduit is not supplying the power to the rest of the circuits on the board.

If you are not a professional and able to troubleshoot in this manner after testing the batter and AC power supply, then I would suggest taking the laptop to a store for them to test the circuitry flow of the mother board.

it's normal and that's how it must work...continiously...if it stops the cpu chip/intel processor will beccome hot and crack...

it sounds like a hardware problem. I would say your high voltage board that drives your lcd has blown probably the caps you buy new on-line and replace it. send to factory service to have fixed. get fixed on warranty if you have it.
please let me if I helped