Mac pro wont boot no chime blank screen fan running 100%

When switching on the mac no chime happens, fans come on as normal then build up to 100% speed and all that happens is the light solid on the front and black screen, did the diagnostic on the logic board all that lights up is the orange trickle LED, i have done reaserch on this and aparently the riser cards have leds that light up when turning on the machine, i have also read that it could be a logic board needs replacing im really hope its not that and something else because they cost a fortune to replace. if anyone knows what is happening would muchly appreciate help
thank you

fair enough thought it would of been a logic board prolem i will try taking out the card and see what happens. if like you said it beeps do i need to replace the power supply ??
If it beeps with the video card removed that would mean it's the video card that is the problem.
I gave the computer a general clean last night but nothing major as in pulling out the cpu and giving it a clean, could that also be a problem ?
It's always good to limit the dust just to minimize overheating. But I don't think that the problem here. Just good maintenance.
also another question what are the symptoms of a logic board failure?
Machine does't work? I can't really be definitive. What happens if there is a logic board failure in your TV? I think you get the line of thought here.
thank you again you are being most helpful
You're welcome and good luck.

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Mac pro wont boot or chime

Mac pro wont boot or chime

you don't know how to provide more details or what you have tried or are you just lost?
What OS is on it? and this is a 4-drive 65 lb workstation and not a MacBook Pro notebook.
Safe Boot
Lion or ML Recovery Mode
Reset SMC
Kernel Panic
Resolving Kernal Panics
http://www.thexlab.com/faqs/kernelpanics.html
http://reviews.cnet.com/8301-13727_7-10344626-263.html
http://macs.about.com/od/usingyourmac/qt/Troubleshooting-Os-X-Kernel-Panics.htm
http://support.apple.com/kb/TS3742
Mac OS X Help
Isolating Issues in Mac OS
http://support.apple.com/kb/TS1388
https://www.apple.com/support/osx/
https://www.apple.com/support/quickassist/
http://www.apple.com/support/mac101/help/
http://www.apple.com/support/mac101/tour/
Get Help with your Product
http://docs.info.apple.com/article.html?artnum=304725
TimeMachine 101
https://support.apple.com/kb/HT1427
Mac OS X & Mountain Lion Community
https://discussions.apple.com/community/mac_os
https://discussions.apple.com/community/mac_os/os_x_mountain_lion?view=discussio ns
Recovery Mode
http://support.apple.com/kb/HT4718
ExpressLane
https://expresslane.apple.com/
Startup Manager: How to select a startup volume
http://support.apple.com/kb/HT1310
Troubleshooting: My computer won't turn on
https://support.apple.com/kb/TS1367
And just in case....
MacBook Pro
https://discussions.apple.com/community/notebooks/macbook_pro
https://discussions.apple.com/community/mac_os?view=discussions
http://www.apple.com/support/macbookpro

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please heeeeelp meeeee my Mac pro not start up
I have mac pro A1186 1.1 2007 xeon 2.66
when press power on turn on and light led power and no sound chime and fan work 100% not boot , help me
sory i don't speak & right english
see my vedio
http://www.youtube.com/watch?v=Qd_rd3qh3Jk
no boot , no chime sound , no screen startup black only ,,, but logic bourd work and vga work 100%

Hi m.r Grant Bennet-Alder
I tried to remove all cards ( hard , vga , pci ),, but no chime sound
you can see my vedio
I tried ( NVRAM and PRAM and SMC ) but no chime sound , no boot , black screen
I bought ddr2 ram server But to no avail
During my research on the Internet told me the possibility that the cause of the motherboard, and they also said (power supply) I motherboard works well and fallow works because it feeds the machine.
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Mac Pro wont boot to logon screen

Help!!
A couple of weeks ago, before upgrading to 10.5.7, my screen would freeze like a picture with the mouse cursor able to move but nothing would respond. I generally had to use the main power button at least 5 times before the display would show anything and get to the logon screen. It seemed to happen when moving the mouse cursor to the top right corner of my display, which I use to "Display all windows". I have since updated to 10.5.7 but was still getting the problem. A couple of times the display just shut off on its own, there was a click within the computer then the display went blank. This has happened a few times.
Last night the screen froze again and I tried the usual reboot about 40 times and only a few times got the Grey Apple screen but would not get any further. If I had a blank screen on reboot the hard drive would be spinning at full speed and would not stop until I switched the machine off.
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Douglas

Hi Peter,
Thank you for your advice. It has taken many reboots to get it to recognise the install disk! Eventually it came up and I ran Disk Utility. It said the drive could not be repaired as Keys were out of order. I managed to install OSX on my second hard drive and I am now copying all the info I need from that drive after which I will reformat it ready for use again.
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Regards
Douglas

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Message was edited by: macbig

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My mac pro wont start up.
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Graphics card
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Mac pro wont boot no chime blank screen fan running 100%

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