I'm having an issue with a computer I've recently been upgrading. I've started upgrading all of the obsolete 4 year old parts, so I've replaced the PSU, CPU, RAM, GPU and Mobo; however, when attempting to start the computer it powers up for a few moments and then shuts down. I've scanned the typical 'what do do if..' threads, followed their advice and still been plagued by the issue. I've tracked the problem to the CPU, by uninstalling everything except for Mobo, PSU, CPU and RAM. When the power button is pressed, the computer starts for a few seconds before shutting down. The CPU fan gives a few weak lurches before stopping. A few seconds later, the computer turns itself on, and then shuts down again. I'm fairly certain it's the CPU because the case fans and GPU fan all start spinning normally when plugged in.
For reference, my specs are as follows:
Motherboard:
GIGABYTE GA-Z77MX-D3H LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 Micro ATX Intel Motherboard
CPU:
Intel Core i5-3450 Ivy Bridge 3.1GHz (3.5GHz Turbo) LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 2500 BX80637I53450
PSU:
SeaSonic M12II 620 Bronze 620W ATX12V V2.3 / EPS 12V V2.91 SLI Ready 80 PLUS BRONZE Certified Modular Active PFC Power Supply
RAM:
Patriot Viper 3 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model PV38G160C9K
It's worth noting that this has been a test run on a new PC- I haven't connected an HDD yet. I know that I can't get past BIOS without a hard drive, but right now I can't even get TO BIOS because the computer shuts itself down.
For reference, my specs are as follows:
Motherboard:
GIGABYTE GA-Z77MX-D3H LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 Micro ATX Intel Motherboard
CPU:
Intel Core i5-3450 Ivy Bridge 3.1GHz (3.5GHz Turbo) LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 2500 BX80637I53450
PSU:
SeaSonic M12II 620 Bronze 620W ATX12V V2.3 / EPS 12V V2.91 SLI Ready 80 PLUS BRONZE Certified Modular Active PFC Power Supply
RAM:
Patriot Viper 3 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model PV38G160C9K
It's worth noting that this has been a test run on a new PC- I haven't connected an HDD yet. I know that I can't get past BIOS without a hard drive, but right now I can't even get TO BIOS because the computer shuts itself down.