Switching on an a60 satelite pro, after 3 seconds it switches off.Ihave changed the cmos battery but still have the same problem

This particular model got it's CMOS (RTC) battery soldered to it's motherboard. You can't just replace it, you should take it to an experienced IT technician, who's good with soldering, in order to de-solder the one that's on board, then solder a new replacement.

I would suggest the following:

Step 1: Press the DEL key to get into BIOS while boot-up.
Step 2: Select the option where it says "Load default settings"
Step 3: save and exit BIOS

After doing so, if you are able to boot your computer, then a new CMOS battery would be required to solve the issue for ever. This problem could also happen, if you haven't used you computer for quite long.

There are 3 ways to do this, first the easiest, changing it directly from the bios, of course if you could do that you probably would not need to. second, you will have a button / switch / jumper that will be on the bottom side of the motherboard, usually accessible through the memory or wireless card compartment. third is the actual small 3 volt battery that is hooked to the motherboard usually directly next to the button / switch / jumper.

replace your cmos battery inside... look for a technician for assistance to remove the cmos battery and change a new one... your battery is weak already

SEND ME LAPTOP TOSHIBA PSA60L OC9003 VGA DRIVER

did u install already all the drivers for the A60???

then, update / flash the bios... http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/modelContent.jsp?ct=DL&os=&category=&moid=1213736&rpn=PSA60U&modelFilter=A60-S1072&selCategory=3&selFamily=1073768663&selModel=1213736|PSA60U

Is it turning off by itself after being on for 20min... each time? I.e. is it consistently turning itself off after the same amount of run time? Check the bottom of the laptop... how hot is it? Might be an over-heating problem. Some freeware (MobileMeter) might help you monitor temperatures and see if it is a problem

MobileMeter
http://www.softpedia.com/get/System/System-Info/MobileMeter.shtml

Some excellent heat management information here:
http://www.technowledgebase.com/2007/07/03/monitoring-your-laptops-temperature/

If you have the manual for *********** board if not print it out, there should be a 3 prong with a jumper on it.. usually you turn off the computer take it off switch it to the prong that wasn't covered and the center prong let it stay there i thin 3-10 seconds then switch it back. turn on your computer and it should be reset

well its quite simple.you have set the wrong latency for rams.
I suggest you put a latency around 3
reset the bios and check the latencyes..you know that you must have all the rams from the computer to the same data..like all the timings or latency.
good luck..
bye bye

We can only assume that because the cd drive operates then the motherboard is operating in part, although, the southbridge chip may be damaged, as the northbridge works memory etc. Maybe it is that the processor is fried as there is no fan and the system then shuts down. Toshiba are probably half way there with the answer, unless; they investigated further and decided it was not the processor but the motherboard.