I cleaned my PC's innards this weekend, first time since November, I'm not a total fool to have touched anything (but then I'm no PC expert either) I used an air blower (designed for camera lenses, not PC cleaning) and a hoover. But I obviously did something, as it failed to boot when I first turned it on?
After a few re-sets, it finally started with no obvious problem, all settings/files/programmes seem fine (to me), but a new screen appears before Windows 7 starts a DOS type page which takes approx 30s-1min to leave.
It has things like: "Intel UMDI, PXE-2.1 (build 003), Copyright (C) 1997-2000 Intel corporation. This product is covered by patents... etc."
Then: "Realtek PCIe GBE Family Controller Series v2.30 (12/24/10)"
Finally: "CLIENT MAC ADDR: F4.............. GUID: xxx..............."
Then: "DHCP.../" -this bit rotates round for the time stated, and then disappears and Windows boots up.
It never did this until Sunday... Have I broken it?
EDIT: PC SPEC:
Case COOLERMASTER ELITE 310 BLUE CASE
Processor (CPU) Intel® Core™i5-2500 Quad Core (3.30GHz, 6MB Cache) + HD Graphics
Motherboard ASUS® P8Z68-V LX: USB 3.0, SATA 6GBs, ATI®CrossFireX
Memory (RAM) 4GB SAMSUNG DDR3 DUAL-DDR3 1333MHz (2 X 2GB)
Graphics Card 1GB NVIDIA GEFORCE GTX 560 Ti - 2 DVI,HDMI,VGA - 3D Vision Ready
2nd Graphics Card NONE
3rd Graphics Card NONE
Memory - 1st Hard Disk 1TB WD CAVIAR GREEN WD10EARX, SATA 6 Gb/s, 64MB CACHE
2nd Hard Disk NONE
SSD CACHE DRIVE NONE
1st DVD/BLU-RAY Drive 24x DUAL LAYER DVD WRITER ±R/±RW/RAM
2nd DVD/BLU-RAY Drive NONE
Memory Card Reader INTERNAL 52 IN 1 CARD READER (XD, MS, CF, SD, etc) + 1 x USB 2.0 PORT
Power Supply 600W Quiet 80 PLUS Quad Rail PSU + 120mm Case Fan (£59)
Processor Cooling SUPER QUIET 22dBA TRIPLE COPPER HEATPIPE INTEL CPU COOLER (£19)
Sound Card ONBOARD 6 CHANNEL (5.1) HIGH DEF AUDIO (AS STANDARD)
Network Facilities ONBOARD 10/100/1000 GIGABIT LAN PORT - AS STANDARD ON ALL PCs
USB Options 6 x USB 2.0 PORTS @ BACK PANEL (MIN 2 FRONT PORTS) AS STANDARD