Tosh 4200 does not boot

Toshiba 4200 series, when powered the green light goes out and the flashing orange light comes on. I have changed the cpu with one i know to work. I have powered with and without the battery. The motherboard is receiving power but the cpu remains cold. Any ideas ?


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Make sure the processor's installed correctly.

Then remove the ram and press the power button, does it beep?
valleytech2005Author Commented:
The cpu is located correctly and locked in position. There is only onboard RAM. There are no audible sounds at all
The ram is soldered to the mobo?
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Make note of the sequence of flashes that the orange light makes. It is a diagnostic code.
Does  it Blinks orange at even intervals (on off on off) or is it a blink pattern with different lengths to the blink, like 1 second blinks and 1/2 second blinks.
If its the second type of pattern then that is a diagnostic code. Post the result of that code here.
valleytech2005Author Commented:
It's a blink pattern as follows:- I  III  II  I  II III II I
The length of each flash is important, not as much the pattern. they will be either 1 second long or 1/2 second long. so an example of the flashing could look like
1 long- 3 short- 2short or a combination of shorts and longs. with 8 flashes in all.
valleytech2005Author Commented:
Sequence is:-  1 short   1 long  2 short  1 long  1 short  1 long  1 short.
The binary code you describe comes out as 0100 1010
This is read backwards as 0101 0010 and are converted into hexidecimal as
error 52h -->C5V voltage is not more than 4.50 V when the computer is booting up.

valleytech2005Author Commented:
The laptop is getting 15v at the power connector ? Tested centre pin and chassis
Is there a cure for this, or is it a motherboard problem ?
Is there a modular cd or dvd drive in that laptop. Remove it and any PCMCIA cards you have in it and try to boot. The motherboard is probably the culprit here as you have tried both ac adapter and battery alone to try and start it up. The service manual for the 4200/4300 series is found here. 
The only serviceable part in the power scheme is the battery plug

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