New PC, no bios/post

h11 · 10-28-2009, 12:52 PM

Finished building my new PC, plug everything in, power on, everything powers up fine. But I get no display. No post screen, and I have absolutely no idea why. Everything is powering up properly, but I'm just getting no display signal, which is really disappointing at this stage.

Specs;

Mobo: Asus P6T
CPU: Intel Core i7 920
GPU: 2x Sapphire ATI Radeon HD 5870 1024MB (Crossfire)
RAM: Corsair XMS3 6GB (3x2GB)
HDD: Intel X25-M 80GB SSD

Phædrus2401 · 10-28-2009, 12:55 PM

What power supply are you using?

h11 · 10-28-2009, 12:56 PM

Sorry, forgot to mention that. Corsair HX 750W.

Phædrus2401 · 10-28-2009, 12:59 PM

Well, it could very well be the power supply. The Corsair HX750W is an excellent PSU, but we recommend a 750W for just one 5870. For two we'd recommend the Corsair TX950W or HX1000W.

Try a bench test first though, just to rule out a case short:
How to Bench Test Your System

Also try using just one 5870 for now. The HX750W should definitely suffice for just one.

h11 · 10-28-2009, 01:48 PM

Tried a single card, didn't work.

**Tyree** · 10-28-2009, 01:54 PM

Bench Test

1) Remove EVERYTHING from the case
2) Set the motherboard on a non conductive surface. The motherboard box is perfect for this. DO NOT PLACE THE MOTHERBOARD ON THE STATIC BAG! It can actually conduct electricity! We are going to try and assemble a running system outside of the case.
3) Install the CPU and heat sink.
4) Install 1 stick of RAM.
5) Install the video card and attach the power supply connection(s) to the card if your card needs it.
6) Connect the monitor to the video card.
7) Connect the power supply to the motherboard with both the 24pin main ATX Power connection and the separate 4 or 8 pin power connection.
8) Connect power to the power supply.
9) Do NOT connect ANYTHING else. Make sure you have the power connector on the CPU fan connected.
10) Use a small screwdriver to momentarily short the power switch connector on the motherboard. Consult your motherboard manual to find which two pins connect to your case's power switch. Then touch both pins with a screwdriver to complete the circuit and boot the system.

If all is well, it should power up and you should get a display. Then assemble the parts into the case and try again. If the system now fails to boot, you have a short in the case and need to recheck your motherboard standoffs.

If the system does not boot after this process, then you most likely have a faulty component. You'll need to swap parts, start with the power supply, until you determine what is defective.

h11 · 10-28-2009, 02:35 PM

Working now. Just switched the RAM over to the other channel and it worked fine. Just installing Windows 7 now. Appreciate the replies folks.

10-28-2009, 12:52 PM	#1 (permalink)
h11 Registered User Join Date: Oct 2009 Posts: 23 OS: XP	New PC, no bios/post Finished building my new PC, plug everything in, power on, everything powers up fine. But I get no display. No post screen, and I have absolutely no idea why. Everything is powering up properly, but I'm just getting no display signal, which is really disappointing at this stage. Specs; Mobo: Asus P6T CPU: Intel Core i7 920 GPU: 2x Sapphire ATI Radeon HD 5870 1024MB (Crossfire) RAM: Corsair XMS3 6GB (3x2GB) HDD: Intel X25-M 80GB SSD

10-28-2009, 12:55 PM	#2 (permalink)
Phædrus2401 Hardware Tech Team Join Date: Mar 2009 Location: New Orleans Posts: 3,747 OS: Vista Ultimate x64 SP1 + Ubuntu 9.04 My System	Re: New PC, no bios/post What power supply are you using? __________________ Good PSU brands: Corsair, SeaSonic, CWT, PC Power and Cooling, Thermaltake Toughpower, CoolerMaster Real Power Pro On 80+ Certification - PSU Information and Selection - Power Supply Myths You don't get what you don't pay for.

10-28-2009, 12:56 PM	#3 (permalink)
h11 Registered User Join Date: Oct 2009 Posts: 23 OS: XP	Re: New PC, no bios/post Sorry, forgot to mention that. Corsair HX 750W.

10-28-2009, 12:59 PM	#4 (permalink)
Phædrus2401 Hardware Tech Team Join Date: Mar 2009 Location: New Orleans Posts: 3,747 OS: Vista Ultimate x64 SP1 + Ubuntu 9.04 My System	Re: New PC, no bios/post Well, it could very well be the power supply. The Corsair HX750W is an excellent PSU, but we recommend a 750W for just one 5870. For two we'd recommend the Corsair TX950W or HX1000W. Try a bench test first though, just to rule out a case short: How to Bench Test Your System Also try using just one 5870 for now. The HX750W should definitely suffice for just one. __________________ Good PSU brands: Corsair, SeaSonic, CWT, PC Power and Cooling, Thermaltake Toughpower, CoolerMaster Real Power Pro On 80+ Certification - PSU Information and Selection - Power Supply Myths You don't get what you don't pay for. Last edited by Phædrus2401; 10-28-2009 at 01:02 PM.

10-28-2009, 01:48 PM	#5 (permalink)
h11 Registered User Join Date: Oct 2009 Posts: 23 OS: XP	Re: New PC, no bios/post Tried a single card, didn't work.

10-28-2009, 01:54 PM	#6 (permalink)
Tyree Mentor Hardware Team Join Date: May 2009 Location: Illinois Posts: 5,496 OS: XP Pro-7RC-Mandriva My System	Re: New PC, no bios/post Bench Test 1) Remove EVERYTHING from the case 2) Set the motherboard on a non conductive surface. The motherboard box is perfect for this. DO NOT PLACE THE MOTHERBOARD ON THE STATIC BAG! It can actually conduct electricity! We are going to try and assemble a running system outside of the case. 3) Install the CPU and heat sink. 4) Install 1 stick of RAM. 5) Install the video card and attach the power supply connection(s) to the card if your card needs it. 6) Connect the monitor to the video card. 7) Connect the power supply to the motherboard with both the 24pin main ATX Power connection and the separate 4 or 8 pin power connection. 8) Connect power to the power supply. 9) Do NOT connect ANYTHING else. Make sure you have the power connector on the CPU fan connected. 10) Use a small screwdriver to momentarily short the power switch connector on the motherboard. Consult your motherboard manual to find which two pins connect to your case's power switch. Then touch both pins with a screwdriver to complete the circuit and boot the system. If all is well, it should power up and you should get a display. Then assemble the parts into the case and try again. If the system now fails to boot, you have a short in the case and need to recheck your motherboard standoffs. If the system does not boot after this process, then you most likely have a faulty component. You'll need to swap parts, start with the power supply, until you determine what is defective. __________________ Posting your PC specs will help us to help you quicker and more efficiently.

10-28-2009, 02:35 PM	#7 (permalink)
h11 Registered User Join Date: Oct 2009 Posts: 23 OS: XP	Re: New PC, no bios/post Working now. Just switched the RAM over to the other channel and it worked fine. Just installing Windows 7 now. Appreciate the replies folks.