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Computer start up when it choose to...

bob666, on Saturday 16 February 2008 à 14:42:31
Hi, guys!

For some reason, my (custom) computer doesn't always boot up correctly. I press the power button and the fans and stuff come on but the screen doesn't...

It does not boot up past the fans. And I sometimes have to try several times make it to boot up.And sometimes it starts the first time.

I took it to a repair shop but they couldn't figure it out. I think the guy wasn't so good nd he wasn't able to give me any hint...

Anyway, any suggestions?
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JohnsonD, on Sunday 17 February 2008 à 13:40:17
Hi, Bob!

I can think of a few possible reasons.

First, do you see the BIOS loading up? If you do, high chance: the mobo is allright. If you don't even see thie BIOS, it means the mobo is screwed and it's time to get a new one, my friend...

Otherwise, it could be that the CPU is fried or damaged or not connected properly. You can check for that.

Other possibility: did you check all the card connections? A lost PCI connection could easily cause such unstable behaviour.

It would help if you could describe exactly when it hangs and what is seen before.

Hope this helps.
   
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GodKillzYou, on Friday 1 August 2008 à 17:55:48
I'm also fixing a computer for a guy who has the same exact problem. Although, his will rarely start correctly.

The first peculiar part is that as soon as the computer is plugged into the wall, it turns on without pressing the power button. But, aside from that, there is no HDD access - the access light only comes on for a split second when the computer turns on. The DVD-ROM lights up and seems to be accessable. All the fans run at what seems to be "full speed," very loudly. No video at all.

I've only gotten it to start normally a couple times... seemingly randomly. I've reset the CMOS a few times. Checked all connections. I don't understand why it will start normally occasionally.
   
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shamus, on Monday 6 October 2008 à 20:23:15
i had the same problem when i built mine. it was working all night and then when i woke up the problem started. i figured out for sum reason the comp wuld start on its side, so i replaced all the screws at the back and that did the trick. just a fought
   
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Raychsr, on Sunday 17 August 2008 à 13:35:49
I saw your post about the computer not starting up. I'm running a 3 year old Power Spec desk top on XP, and yesterday my computer now won't start up at all. When I hit the power button, it starts to power up for about 2 seconds, and then shuts itself off. I also have to recycle the on/off switch for the power button to work. I've cleaned everything out, all fans appear to be running (except the graphics card, but it doesn't even get far enough to display the BIOS on the screen), and all connections are in tact. All new and frustrating behavior.

Do you have any other ideas for me? Thanks
   
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GodKillzYou, on Sunday 17 August 2008 à 14:28:32
Your first step should be to try a new power supply. If that doesn't work, then, unfortunately, you've got a bad motherboard. That's what happened with the PC I was working on. The new power supply made no difference. It was actually the motherboard that was at fault.

Just check to make sure all of your cards and memory are seated properly, and the power button connection is OK. Some people have had problems with a faulty power button.
   
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Eoin, on Thursday 7 August 2008 à 19:48:58
I'm having this problem also.

It is a brand new computer. This has happened from the start.

Sometimes it starts. Sometimes it starts, you see it all starting like normal. then it reboots and the screen doesn't come on. The speakers make the power off and on sound so it's not just a screen issue.

To answer the previous person here is a solution I have found ages ago, which still seems to solve some problems.

My friends computer started but the screen didn't it was like it was in standby mode all the time. I told him:

Unplug the screen, the power cable from it, and leave it 24hrs. Then plug it in and start your computer. Somehow it drains it fully of power and stops the standby situation.

Hope this helps, if anyone can help me then please do.
   
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Computer Guru, on Monday 13 October 2008 à 00:44:25
I had a similar problem and was able to fix it by removing one of my RAM cards. It turns out if one of your RAM cards are going out or are dead it will do nothing but the fans will run and nothing shows up on screen. Take out your ram and switch them around and see what happens. Chances are if its only part of the time your ram is starting to die. and its easy to switch them around try running it with one if the problem persists, try with the other. If there is still a problem switch it around and if there still is you may have to check if your cpu is completely in the computer. Check the motherboard, cpu, but first check the RAM. I did not think RAM would effect bios startup but it did on mine and removing the faulty card fixed all the problems. I hope this helps!!
~Computer Guru
   
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20100, on Wednesday 15 October 2008 à 03:39:19
funny you mention the ram fix, cause I had the same problem with an old computer and managed to get it to start after playing with the memory (removing all the cards and playing with them) and resetting the bios.

20100
   
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Joel Logue, on Wednesday 12 November 2008 à 01:08:27
My new build just did the same thing today. I went to school and came home and it wouldn't show anything. I checked the ram the, the video cards and then it eventually stopped booting up into windows. I saw that someone mentioned to try and check for shorting of the motherboard. Pulled it out and it started right up. I don't see how it could of come lose when I just built it on last Monday. Hopefully this helps your problem or reduced down your list of problems.

Thanks

Joel
   
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CHESAPEAKE, on Thursday 13 November 2008 à 02:49:45
Whats up:
When you said you removed the motherboard did you put it back in or leave it out buy the way where and what is a motherboard ( sorry old dog new tricks still learning)



THANKS
   
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super, on Tuesday 18 November 2008 à 17:24:45
how would you know if the mobo is dead and not the mobo+CPU?
   
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 Kahula, on Thursday 20 November 2008 à 04:50:31
Along the same lines, I just finished a brand new build (even had to send the MOBO and Vid back for new ones) for a graphics workstation PC running Vista. The PC won't start up unless I manually power down the PSU for at least five seconds, repower, and hit the power button. Otherwise, the computer will boot up but I won't hear the system beep and I'll not get any video. Once I've done my method, I can restart, etc. As long as I don't go into sleep mode, all is well.

Any ideas?
   
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