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Startup Without CPU

Brennan808
By Brennan808
in CPUs, Motherboards, and Memory
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Hey so I have a ASUS P8H61-M LE/CSM and currently no cpu for it. When I plug the psu in and put in ram as well as a cpu fan and try to turn it on it turns on for a split second then turns right back off. There is a green light that is always on on the mobo when plugged in and that is on. Does it need a cpu to be able to stay on?

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It needs a CPU to do everything. Only a few top-end boards can let you use the BIOS without the CPU (to update it), but that's it.

CPU: i7-2600K 4751MHz 1.44V (software) --> 1.47V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.3MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2203MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1

 

Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV SA undervolt) GPU: GTX 1060 6GB Mobile (+80/+450, 1650MHz~1750MHz 0.78V~0.85V) RAM: 8+8GB DDR4-2400 18-17-17-39 2T Storage: HP EX920 1TB PCIe x4 M.2 SSD + Crucial MX500 1TB 2.5" SATA SSD, 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally, 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172) left outside Monitor: 1080p 126Hz IPS G-sync

 

Desktop benching:

Cinebench R15 Single thread:168 Multi-thread: 833 

SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s

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1 minute ago, Tiwaz said:

well theoretically the fans and other simple devices could be run but if the mobo doesnt detect any CPU it will just shut down again

So you dont think that I have a dead board from the symptoms it has? It will be a couple days before I get the cpu and I am worried it might go outside the return period. Thanks for the help.

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1 minute ago, Jurrunio said:

It needs a CPU to do everything. Only a few top-end boards can let you use the BIOS without the CPU (to update it), but that's it.

But what I am worried about is that it wont keep the fans on after startup. I know it will never boot into bios without the cpu.

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1 minute ago, Brennan808 said:

So you dont think that I have a dead board from the symptoms it has? It will be a couple days before I get the cpu and I am worried it might go outside the return period. Thanks for the help.

Well, you can't say it's broken if you can't test it... Just wait for the CPU.

Computer engineering PhD student and RFML researcher

 

Daily Driver:

CPU: Ryzen 7 4800H | GPU: RTX 2060 | RAM: 32GB DDR4 3200MHz C16 | OS: Debian 13

 

Gaming PC:

CPU: Ryzen 5 5600X | GPU: EVGA RTX 2080Ti | RAM: 32GB DDR4 3200MHz C16 | OS: Windows 11

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1 hour ago, Brennan808 said:

Hey so I have a ASUS P8H61-M LE/CSM and currently no cpu for it. When I plug the psu in and put in ram as well as a cpu fan and try to turn it on it turns on for a split second then turns right back off. There is a green light that is always on on the mobo when plugged in and that is on. Does it need a cpu to be able to stay on?

Just wait for the cpu. Most likely everything will be fine. It cannot post without a cpu.

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