I have had an issue with my computer where it started off just crashing and rebooting itself when I was using my PC and it would be fine after the reboot for a while although recently (3 weeks ago) My computer refuses to get past the BIOS. I have changed my PSU, CPU and MOBO which were all suggestions and that still hasn't fixed the problem. I have even tried unplugging the hard drives and GPU and launching a bootable disk (linux) and it still crashes. I have ran memtest x86 and it passed those. I'm just completely stumped as to what the cause is, any help would be greatly appreciated.
Specs
CPU - i54570
MOBO - Gigabyte B85 HD3
PSU - Corsair CX750w
RAM - G-Skill 8GB (2x4GB) DDR3 1600Mhz RipjawsX Memory Kit CL9 (9-9-9-24) 1.5V
GPU - Gigabyte GTX 650 1GB GDDR5 VGA Dual DVI HDMI PCI-E Graphics Card
HDD - Seagate 1TB Barracuda 3.5" SATA-III Hard Drive - 7200RPM 64MB Cache
SSD - OCZ 128GB Agility 4 SATA III SSD
Optical drive - Samsung SH-222BB 22x DVD±RW DL & RAM SATA Optical Drive - OEM Black
Specs
CPU - i54570
MOBO - Gigabyte B85 HD3
PSU - Corsair CX750w
RAM - G-Skill 8GB (2x4GB) DDR3 1600Mhz RipjawsX Memory Kit CL9 (9-9-9-24) 1.5V
GPU - Gigabyte GTX 650 1GB GDDR5 VGA Dual DVI HDMI PCI-E Graphics Card
HDD - Seagate 1TB Barracuda 3.5" SATA-III Hard Drive - 7200RPM 64MB Cache
SSD - OCZ 128GB Agility 4 SATA III SSD
Optical drive - Samsung SH-222BB 22x DVD±RW DL & RAM SATA Optical Drive - OEM Black