When I turn my Toshiba Satellite m35x on there is no display and it makes 1 short beep - 3 short beeps - 3 short beeps - 1 beeps

Sometimes after trying a lot it works fine but each time take more tries
what can i do???

Toshiba Satellite M35X beeps this way when you have a memory related problem. Either the memory module is bad or it’s not making a good contact with the motherboard. Try reseating the memory module, move it to another slot. Try installing a known good memory module and see if it helps.
It’s possible that there is nothing wrong with the memory module and you have a problem with the memory slot on the motherboard, but this kind of failures is not very common. In this case you still can use the laptop if you move the memory module from the defective slot to a working one.

I recently acquired a Dell latitude notebook but it gives me a beep error on startup. I press the power on, the power light comes on the hard drive starts up but all three of the lock keys light up and system beeps 5 - 1 -2 (five long beeps, pause, 1 long, pause, 2 long) then it shuts down completely. This system never gets past this point, I’ve tried pushing down on the keyboard, I’ve disassembled it and checked connections and still get these beeps! It’s driving me looney.

I think you have a memory problem. After some search on the Internet I found this diagnostics and troubleshooting page which has a chart with system beep codes. According to this chart 5-1-2 code indicates a memory problem. Here’s a quote from this page:
“When you turn on or reboot the system, the Caps Lock and Scroll Lock indicators on the keyboard should flash momentarily and then turn off. If the Num Lock category in the System Setup program is set to On, the Num Lock indicator should flash momentarily and then remain on; otherwise, it should turn off. Abnormal operation of these indicators can result from a defective SIMM in socket A.”
I think it’s similar to your problem, try replacing the memory module.

I am getting continues beep sound when I turn on my laptop. It says press F2 or F12After pressing F2 or F12, Nothing happens. Any advice?

I think you are getting a beep sound (error) when you turn on the laptop because of a defective keyboard. Most likely a key or keys got stuck causing the laptop to make a beep error. You can try to disconnect the keyboard from the system board and turn on the laptop without the keyboard connected. If the laptop will boots fine, then the keyboard is your problem.