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[Solved] Computer not starting when plugging in graphics card(s)

post #1 of 8
Thread Starter 
setting up a mining rig, Installed the OS etc via the mobo's vga works fine, runs stable. When I was ready to hook up the graphics cards, the computer tried to start several times but wouldnt. Thinking well lets just try one gpu, I unplugged all of them but one, same problem. unplugged them all, worked just fine with no gpus. the gpus are 4 7850's. Anyone have any idea what might be the culprit?
new toys, yay
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new toys, yay
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Intel i5 2500k @ 4.4ghz Asus P67 Sabertooth Radeon HD 6950 2GB Xfire 8gb Gskill Ripjaw 1600 
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C300 64gb/640gb WD Black Windows 7 x64 Pro Shimian 27in 1440P IPS Saitek Eclipse 
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Corsair 750TX HAF 932 G500 
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post #2 of 8
What power supply? Maybe not enough power.
RYZEN
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20TB_HOMENAS
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RYZEN
(14 items)
 
OFFICE PC
(12 items)
 
20TB_HOMENAS
(9 items)
 
CPUMotherboardGraphicsRAM
Ryzen 1700X ASRock Fatal1ty X370 Professional Gaming XFX 390x Corsair Vengeance LPX 64GB DDR4 
Hard DriveOptical DriveCoolingOS
A bunch of swappable SSDs LG BD-ROM Thermaltake CL-P039-AL12BL-A Contac Silent Windows 7 
MonitorKeyboardPowerCase
Generic Korean 32" 4K Generic mechanical rainbow LED lit SeaSonic G Series 550-Watt AZZA Helios 910 CSAZ-910 
MouseAudio
Logitech G500 T1 24BIT Tube USB DAC 
CPUMotherboardGraphicsRAM
AMD Athlon II X2 255 ASRock 970DE3/U3S3 Radeon X300 Kingston KHX1600C9D3/4GX 
Hard DriveHard DriveHard DriveHard Drive
8x Samsung HD204UI 7x Seagate ST2000DM001 Transcend TS16GSSD25-S 2x WD WD40EZRX 
Case
AZZA Helios 
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post #3 of 8
That's what i am thinking, possibly power supply.
     
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i7 3820 WC'd ASRock Fatal1ty X79 Professional Sapphire + Gigabyte R9 290X CF WC'd 16GB G. Skill Ripjaws Z 
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2x 3TB Seagate Barracuda 7200.14 RAID 1 2x 250GB Samsung 840 Series SSD RAID 1 Samsung Burner w/ Lightscribe Custom Watercooling 
OSMonitorKeyboardPower
Windows 10 Professional 64-bit LG 34UC88 (3440x1440) + Crossover 27Q 1440p Roccat Ryos MK Pro Cherry MX Brown Cooler Master Silent Pro 1200W Gold 
CaseMouseMouse PadAudio
Cooler Master HAF 922 w/ Dust Filters Roccat Kone XTD + Roccat Apuri 2x XFX Warpad ODAC > Glow Amp One > K702/65 
AudioOther
Yamaha Receiver + 5.1 Xbox One Wireless Controller 
CPUMotherboardGraphicsRAM
Intel Core i5 540M @ 3.33Ghz DC 3.65Ghz SC Acer Intel HD 3000 + ATi Radeon HD 5650M Switchable 4GB 
Hard DriveOSMonitorMouse
OCZ Vertex 2 SSD Windows 7 Ultimate SP1 x64 13.3" 1366x768 G700 
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post #4 of 8
well mining is generally a waste of money considering that there are so many people going after a limited number of coins that the prices for the "good" mining cards have tripled, which is hilarious because they were only "good" because they were cheap, so I'm going to assume you know little about computers and are simply the latest get rich quick victim.

There are a bunch of reasons this could be happening. Chief amongst them is not enough power. Many PSUs don't even have enough separate power cables to do 4 gpus, let alone actually have the juice to power them. Diagnosing your actual problem is hard, because the rig you have listed is apparently not the one you are using, since it has different GPUs
New gaming rig
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4770k some mid range asrock. extreme 4 maybe? 2x gigabyte windforce 7950 2 x 8 corsair balistix sport 
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crucial ct960 LG blu-ray used venamous x win 8.1 pro 
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Crossover 30Q5 PRO 30" 2560X1600  cheapest piece of crud I could find antec HCG 750 some thermaltake microcenter blue-light-special... 
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came with the cheapass keyboard who cares? some $30 no name 2+sub speakers I bought at mic... 
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New gaming rig
(15 items)
 
  
CPUMotherboardGraphicsRAM
4770k some mid range asrock. extreme 4 maybe? 2x gigabyte windforce 7950 2 x 8 corsair balistix sport 
Hard DriveOptical DriveCoolingOS
crucial ct960 LG blu-ray used venamous x win 8.1 pro 
MonitorKeyboardPowerCase
Crossover 30Q5 PRO 30" 2560X1600  cheapest piece of crud I could find antec HCG 750 some thermaltake microcenter blue-light-special... 
MouseMouse PadAudio
came with the cheapass keyboard who cares? some $30 no name 2+sub speakers I bought at mic... 
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post #5 of 8
Thread Starter 
The PSU is 850w, which should be enough for four. It def is enough for one, thats for sure. each gpu takes 1 6pin connector, the psu has 4 6pin connectors. To the person talking about get rich quick schemes, all of these were bought with profit from previous mining/investing. So not really 'costing' me anything. However that's neither here nor there. But thanks for your input.
new toys, yay
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CPUMotherboardGraphicsRAM
Intel i5 2500k @ 4.4ghz Asus P67 Sabertooth Radeon HD 6950 2GB Xfire 8gb Gskill Ripjaw 1600 
Hard DriveOSMonitorKeyboard
C300 64gb/640gb WD Black Windows 7 x64 Pro Shimian 27in 1440P IPS Saitek Eclipse 
PowerCaseMouse
Corsair 750TX HAF 932 G500 
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new toys, yay
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel i5 2500k @ 4.4ghz Asus P67 Sabertooth Radeon HD 6950 2GB Xfire 8gb Gskill Ripjaw 1600 
Hard DriveOSMonitorKeyboard
C300 64gb/640gb WD Black Windows 7 x64 Pro Shimian 27in 1440P IPS Saitek Eclipse 
PowerCaseMouse
Corsair 750TX HAF 932 G500 
  hide details  
Reply
post #6 of 8
What do you mean by "tries to start?" Do you mean that it can't load the OS or that it won't even get to the BIOS or that it won't even start the fans?
Lightweight gamer
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AMD FX-8320 ASRock 960GM/U3S3 Sapphire Radeon HD 6670 Generic RAM from Ebay 
Hard DriveHard DriveHard DriveOS
Western Digital Caviar SE WD1600 Seagate Barracuda 7200.9 OCZ Vector Windows 7 Professional Edition x64 
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Rosewill 500-watt PSU Rosewill REDBONE Logitech M215 Cordless Mouse 
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Lightweight gamer
(11 items)
 
  
CPUMotherboardGraphicsRAM
AMD FX-8320 ASRock 960GM/U3S3 Sapphire Radeon HD 6670 Generic RAM from Ebay 
Hard DriveHard DriveHard DriveOS
Western Digital Caviar SE WD1600 Seagate Barracuda 7200.9 OCZ Vector Windows 7 Professional Edition x64 
PowerCaseMouse
Rosewill 500-watt PSU Rosewill REDBONE Logitech M215 Cordless Mouse 
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post #7 of 8
has enough power and has enough power on the appropriate bus bar are two different things. If your PSU pulls all it's vido power of one bar, and that bar doesn't have enough power, you;re still hosed. Without the PSU model there's no way to know.
New gaming rig
(15 items)
 
  
CPUMotherboardGraphicsRAM
4770k some mid range asrock. extreme 4 maybe? 2x gigabyte windforce 7950 2 x 8 corsair balistix sport 
Hard DriveOptical DriveCoolingOS
crucial ct960 LG blu-ray used venamous x win 8.1 pro 
MonitorKeyboardPowerCase
Crossover 30Q5 PRO 30" 2560X1600  cheapest piece of crud I could find antec HCG 750 some thermaltake microcenter blue-light-special... 
MouseMouse PadAudio
came with the cheapass keyboard who cares? some $30 no name 2+sub speakers I bought at mic... 
  hide details  
Reply
New gaming rig
(15 items)
 
  
CPUMotherboardGraphicsRAM
4770k some mid range asrock. extreme 4 maybe? 2x gigabyte windforce 7950 2 x 8 corsair balistix sport 
Hard DriveOptical DriveCoolingOS
crucial ct960 LG blu-ray used venamous x win 8.1 pro 
MonitorKeyboardPowerCase
Crossover 30Q5 PRO 30" 2560X1600  cheapest piece of crud I could find antec HCG 750 some thermaltake microcenter blue-light-special... 
MouseMouse PadAudio
came with the cheapass keyboard who cares? some $30 no name 2+sub speakers I bought at mic... 
  hide details  
Reply
post #8 of 8
Thread Starter 
not trying to keep anything a secret, thats foolish. when I meant it wouldnt start, it wouldnt even get to BIOS. I found the problem though, there was something touching the motherboard causing a short. Its starting now and running fine(with one gpu hooked up anyway).

While I appreciate your technical help bombastinator, your opinion on mining seems to be very different than alot of people on this very forum. According to every calculator out there, mining is still quiet profitable. Anyway, like i said these machines were bought with the profit from mining on my sigrig. so even if i end up making no money from this point forward, I wouldnt have lost anything but time.

thank you to everyone who helped, I seem to have fixed my problem!
new toys, yay
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel i5 2500k @ 4.4ghz Asus P67 Sabertooth Radeon HD 6950 2GB Xfire 8gb Gskill Ripjaw 1600 
Hard DriveOSMonitorKeyboard
C300 64gb/640gb WD Black Windows 7 x64 Pro Shimian 27in 1440P IPS Saitek Eclipse 
PowerCaseMouse
Corsair 750TX HAF 932 G500 
  hide details  
Reply
new toys, yay
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel i5 2500k @ 4.4ghz Asus P67 Sabertooth Radeon HD 6950 2GB Xfire 8gb Gskill Ripjaw 1600 
Hard DriveOSMonitorKeyboard
C300 64gb/640gb WD Black Windows 7 x64 Pro Shimian 27in 1440P IPS Saitek Eclipse 
PowerCaseMouse
Corsair 750TX HAF 932 G500 
  hide details  
Reply
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