Mac Pro starts up and then shuts down, how do I fix this?

Recently when I start up my Mac Pro it start its process and then I see the Apple Logo and then the screen goes black and the monitor says I think something like no digital signal. I have to start up my Mac Pro a number of times before it finally stays open. Because I use to see a bright flash when the Mac Pro would start up or shut down, I thought that may be the problem had to do with my monitor but I'm not sure. I tried disk utilities and Tech Tools Pro 6 but nothing so far has helped the problem. I don't think its my harddrive since all test say its OK. Then I remembered some says something that computers have an internal battery and that they need to be replaced from time to time. I don't know if my Mac Pro has a battery but does anyone know if this would cause my problem?

There is a pram battery but I don't think that's the cause of your problem.
Have you blown all the accumulated dust out of your machine?
Try reseating the video card, maybe the ram too.
Run Apple Hardware Test (boot from your second installer DVD, push D down immediatly after the boot chime).

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http://support.apple.com/kb/ht5137
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Hi ...
I'm hoping that someone out there can help me ...
I purchased an Apple 24" iMac about 3 years ago ...
It was pretty much working perfectly until 2 days ago ...
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Is this simply a boot problem ? ...
What alternatives do I have to boot up / correct the problem ? ...
I'd be ever so grateful if someone out there could help walk me through alternative actions to take ...
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Hello
Try target disk mode see if your mac shut down from this way , to do that
hold hon at start up "T" on key board just after startup sound until screen show a firewire logo as screen saver
and wait ..
if by chance you have a second mac you can use a fire wire cable to link it , in that way your mac is like an external hard drive , most easy way to recover data from it
Try start in single user mode , use COMANDE - S at start up
Try start in safe mode , use SHIFT key at start up
if in all case you mac shut down after 1 or 2 min of use , certenly mean a mother board and or powersupply problem
be sure to have perform SMC and PRAM reset at least 3 times each
HTH
Pierre

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marco12345 wrote:
Please Apple, have some professional personnel respond to this message with a useful response. Not a copy & paste of your commonn reponces, I have tryed them all and don't work for this problem. iPads don't come chip and my mom's made her very happy while it worked.
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http://www.macblend.com/how-to-calibrate-your-mac-iphone-or-ipad-battery/
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Apple: iPad Battery Nothing to Get Charged Up About
http://allthingsd.com/20120327/apple-ipad-battery-nothing-to-get-charged-up-abou t/
Apple Explains New iPad's Continued Charging Beyond 100% Battery Level
http://www.macrumors.com/2012/03/27/apple-explains-new-ipads-continued-charging- %20beyond-100-battery-level/
New iPad Takes Much Longer to Charge Than iPad 2
http://www.iphonehacks.com/2012/03/new-ipad-takes-much-longer-to-charge-than-ipa d-2.html
Apple Batteries - iPad http://www.apple.com/batteries/ipad.html
iPhone: Hardware troubleshooting (Power/Battery section also applies to iPad)
http://support.apple.com/kb/TS2802
http://www.overthought.org/blog/2014/the-ultimate-guide-to-solving-ios-battery-d rain
http://www.overthought.org/blog/2014/the-ultimate-guide-to-solving-ios-battery-d rain
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http://osxdaily.com/2013/09/19/ios-7-battery-life-fix/
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http://www.zdnet.com/poor-battery-life-after-installing-ios-7-1-try-these-simple -tips-7000027348/
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http://support.apple.com/kb/HT4060
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http://thehowto.wikidot.com/prolong-battery-lifespan-for-ipad
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http://support.apple.com/kb/HT4327
Install and use Battery Doctor HD
http://itunes.apple.com/tw/app/battery-doctor-hd/id459702901?mt=8
To Extend a Device’s Battery Life, Get to Know It Better
http://tinyurl.com/b67c7xz
iPad Battery Replacement
http://www.apple.com/batteries/replacements.html
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 Cheers, Tom

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