PC requires 2 attempts to start.

[Jules59]

My PC is running fine, but requires 2 attempts to start;
I switch on - I get a single POST bleep - then it powers off before anything appears on the screen - wait a few seconds - then it restarts by itself - single POST bleep - continues to boot up with BIOS logo on screen and then loads Win 7 normally.
Anyone got any ideas why this is happening.

Only "OC" changes Ive made are to run the 16GB of RAM at 2133Mhz via XMP profile 1.

System is:

Artic Blue Power Supply 850W

Mainboard : GigaByte Z77-D3H

BIOS : AMI (OEM) F15 07/10/2012

Total Memory : 16GB DIMM DDR3

Processor : Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz (4C 8T 3.9GHz, 3.9GHz IMC, 4x 256kB L2, 8MB L3)

Socket/Slot : FC LGA1155

Memory Controller : Gigabyte Core (Ivy Bridge) DRAM Controller 100MHz, 2x 8GB DIMM DDR3 2.13GHz/1.6GHz 128-bit

Memory Module : AMI CMZ8GX3M2A2133C11 4GB DIMM DDR3 PC3-17100U DDR3-2132
Memory Module : AMI CMZ8GX3M2A2133C11 4GB DIMM DDR3 PC3-17100U DDR3-2132
Memory Module : AMI CMZ8GX3M2A2133C11 4GB DIMM DDR3 PC3-17100U DDR3-2132
Memory Module : AMI CMZ8GX3M2A2133C11 4GB DIMM DDR3 PC3-17100U DDR3-2132

Video Adapter : NVIDIA GeForce GTX 650 Ti (4CU 768SP SM5.0 1GHz, 256kB L2, 2GB 5.4GHz 128-bit, PCIe 3.00 x16)

Logical Storage Devices
DATA HDD (E : 932GB (NTFS) @ Seagate ST1000DM003-9YN162 (1TB, SATA600, 3.5", 7200rpm)
BACKUP HDD (F : 466GB (NTFS) @ SAMSUNG HD502HJ (500.1GB, SATA300, 3.5", 7200rpm, 16MB Cache)
MAIN SSD (C : 112GB (NTFS) @ OCZ-AGILITY3 (120GB, SATA600, SSD)
USB-ARCHIVE (G : 466GB (NTFS) @ Seagate ST9500325AS (500.1GB, USB2/SATA150, 2.5", 5400rpm, 8MB Cache)
Optical Drive (D : N/A @ TSSTcorp CDDVDW SH-224BB (SATA150, DVD+-RW, CD-RW, 2MB Cache)

Network Services
Network Adapter : Atheros AR8151 PCI-E Gigabit Ethernet Controller (NDIS 6.20) (Ethernet, 100Mbps)

Operating System
Windows System : Microsoft Windows 7 Home 6.01.7601 (Service Pack 1)
Platform Compliance : x64

 

[TrainableMan]

If you run Memtest86+ do you get any RAM errors?

If you restore your RAM to recommended clock speed does it still restart? Normal problem debugging protocol is to restore to factory defaults and see if the problem continues.