When i boot up i can see by the flickering led's that it's running but nothing on screen, i have replaced the motherboard and processor, but still it won't stay on, it comes on for a second then goes off, windows log on shows for a second then goes off, it won't stay on long enough to even type my password, but if i type my password youcan see the pc working, i'am at a total loss
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Try to remove your battery and hold the power button for about 45-60 seconds. Then put your battery back in, and try to reboot. This may not help, I'm just eliminating possibilities hoping your motherboard isn't at fault.
Unfortunately I wish I had better news. Let me explain.
The "white screen" happens on these machines a lot. It appears to be a problem with the video or video card, but that's not neccesarily the case. The display shows the white screen on power up until the video is initialized. Normally bios should initialize it during boot. The fact that you see HDD activity IS most likely point to it being a video issue, but that activity if it only lasts for a short time could just be the drive spinning up and initializing itself. If you see it running for a much longer period of time, then most likely you're correct and the machine is booting which means it is the video.
With all that said, there is obviously a failure of some sort in the video or motherboard. You've already checked the ram, which could result in it not booting. You also mention checking for lose cables. Assuming you checked all the video terminations, then frankly there isn't a lot more you can do.
The only real option if you want to keep the existing machine is to replace the motherboard. Pretty much everything is built into it, so replacing that will replace both the video and motherboard. Your local computer store should be able to order a replacement, or I'm sure it would be easy to find online from several dealers.
I'm assuming it's not still under warranty? It may be worth calling Sony if you aren't sure.
If you don't care about keeping the same machine, in a lot of cases when there is a complete failure like this, it's often times more practical to purchase a new machine and use whatever parts can be salvaged out of the old. The all-in-one doesn't leave a lot of options for that, but the hard drive (and it's data) as well as the ram and maybe even processor may be able to be ported to a new machine. Sometimes you may find it's not even worth doing that, you might be better off just porting the drive and getting better/faster ram and processor.
make sure there is no disks in any drives then test your PSU and all leads that attach to your hard drive from electrical to IDE,SATA from your motherboard aswell then check all leads that attach to cd,dvd,3.1/2 floppy drives are secure and not faulty
hope this helps
Replace cpu fan , failed cpu fan might have caused CPU stoped working. If you are sure about the CPU fails then replace the CPU. If the problem seems continues after that too, then PC might have failed to boot due to other reasons. What shows on the screen once you power on the computer? There could be , motherboard , or harddisk faults too. Try unplugging other parts and see if the computer boots from CD or USD flash or floppy drive!!
Once you know that motherboard works then replace the CPU. There could be BIOS setup problem. Did you check the BIOS for harddisk is set properly.
How do you know the graphic card is working if you can't get a picture?
Sorry to be basic about this, but you really need to go back and check your connections again.
Do you have another Mac? You can boot the Mac Pro into target disk mode, then boot the other Mac off its disk using a FireWire cable. Then you can set up Apple Remote Management and enable VNC logins on that machine; then shut everything down and reboot the Mac Pro of its own drive. From the other Mac, use Chicken of the VNC to remotely view the Mac Pro's "screen" (I assume existence of an ethernet network here). Now you can run any tool on that Mac from the other Mac -- visit the Displays panel, look at System Profiler, etc., just as you would if the hardware display were working.
I have experienced something similar with my new Core2Duo processor and a fairly new Socket 775 processor. Troubleshooting it led me to believe the CPU simply wasn't compatible with the motherboard.
Although it's a shot in the dark, I suggest that you try out some of the following:
- Did you try pulling out the graphics card to see if you got it to POST then? The graphics card or the monitor may need replacing.
- Did you remove the RAM?
- Are you sure all cables are attached properly?
- Try to take out the CPU, talk to a friend with a socket 478 motherboard and replace his CPU with your CPU. Does it work now? If yes, motherboard needs to be replaced.
Could be a power supply problem but suspect its a problem with the motherboard. Unless you have a spare power supply or testing equipment I would suggest you take this to the local repair shop. For $30 they should be able to give you a good idea if the power supply is shot (cheap fix) or the motherboard (more expensive). Be aware that I also found lots of cases where a bad Emachine power supply also damaged the motherboard as well.