Toshiba satalite L305D starts then shuts off. Need help.

Basically the computer will start then about 10-20 sec later will shut off. No display what so ever. Doesnt seem like the computer is getting to POST.
Ive done my research, im just looking for some things to try.
Things Ive tried.
* Changed power adapter.
* Attached VGA to external monitor.
* Holding the power button for 60 sec without battery and AC (refresh trick)
* Replaced the entire Motherboard ( yep even that didnt work)
* Removed and Re-applied thermal paste to CPU and Heatsink.
At this point Im thinking its either the CPU not getting good air flow, or just dead or possibly a CMOS problem. I also tried to remove the CMOS battery, but its Soldered on.
Any help would be appriciated. Also, buying a new computer is not an option.

might be an air flow issue with over heating. might try to take apart the computer and give it a cleaning for dust build up. the other issue is the battery for the cmos could be shot i have had another computer that had this issue before and wouldn't start as well the cmos battery is should be sodered in, like you said. what i did is desoder it and replaced it with another sililar battery from another laptop i wasnt using i'm sure you can purchase one from amazon as well or ebay; and sodering the new on into place. hope this helps.

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I could use some guidance on troubleshooting steps to isolate this problem. My Mac was stored for about 3 years in its box in an AC controlled environment. Now we want to get some files from it - it started up and ran for about 10 minutes then shut off suddenly. It would not restart. Unplugged the cord after waiting about 15 minutes and it started again ran for 5 minutes and shut off (not shutdown just off like it was unplugged). The next day tried again and it started for about 10 seconds before shutting off. The first two times it started it asked to set the date and time so the pROM battery must be dead.
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Can you feel the power supply fan's flow of air out the back of the computer's case? What you've described can occur when a failing or dead fan doesn't maintain a tolerable temperature within the power supply. When it gets hotter than it should, a thermal trip kicks in and turns off the computer to prevent any permanent damage. The fact that you can restart the computer after a cooling down period, only to see the computer shut down again after a brief period, is symptomatic of power supply fan failure. Check the fan's ouput, and if it's only producing a weak flow of air, you should open up the computer's case and try blowing out any internal dust from the power supply/cooling fan. You'd be surprised to see how much dust gathers on the backside of the fan blade itself, even though the power supply looks relatively clean from the outside. I'd recommend using a can of compressed air and not a vacuum cleaner internally, because the vacuum cleaner's plastic attachments acquire a static charge. With the cover off, turn ON the computer and visually observe the fan's movement. If it runs intermittently or not at all, you should disassemble the power supply and replace it. Some users have gotten more life out of old/weak/noisy fans by spraying the shaft with WD40 or an equivalent product, to lubricate the worn sleeve bearing. The results of this procedure are mixed, because in cases of fan failure, the cause is often a weak magnetic field that's inadequate to spin the blade.

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How old is the Time Capsule? What model number?
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I've backed up some. But I'd love to be able to get at the other stuff on there. I'm going to acquire the disks although I just don't remember which version of 10.5 it is.
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I updated my ipod touch, then a while later it said waiting for update then shut off. then started turning on and off, what do i do ?

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Try:
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Hi - need your help before vacation on a long holiday weekend. As of yesterday, my video ipod was working great. Now, when I turn it on or plug it in, it continually tries to turn on by showing the Apple logo then shuts off and keeps doing this. It will not play nor will recognize that it is plugged into the computer or wall. I am using different cords and also went through the 5 "R"s...would love some insight or tricks to make it work.
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http://support.apple.com/kb/ts2802
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Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion. Learn about LCIs and corrosion.
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Hello...and apologies for the delayed reply!
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Applying power to your BB between it getting wet and doing the proper process (including the maximum waiting time) reduces the chances of success. Further, the only thing predictable about moisture intrusion into a BB (indeed, any electronic device) is that the results will be unpredictable. I've seen some come back up right away and be fine. I've seen others never work at all. I've seen still others run for a bit, and then die later. And every thing in between.
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Iphone 4s freezing at start up then shuts off and keeps restarting then repeating that process over and over. I have tried to reset the phone two different ways and still this problem occurs after I update it or turn off the phone.

yes the title says most of what is going on.
I recently reset my phone, losing all contacts and pictures. It was working fine, then after I updated it, it will not turn on completely.
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Try these in order testing your system after each to see if it's back to normal:
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Toshiba satalite L305D starts then shuts off. Need help.

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