As best as you can make sure the slot and the cross bars in the bottom of the slot have no extra pieces of plastic in the way.
I had a RAM slot that wouldn't let the stick seat properly on this ASUS board.
When I looked closely and compared it to a slot that did work it had a tiny piece of plastic in that one slot left over from the molding process.
Xacto knife trimmed it and no more problem.
It was very small piece of plastic but in the tight slots that was all that was needed. This- * - was bigger than that extra piece was.
If like me clean your reading glasses and drag out the magnifying glass.
I had a RAM slot that wouldn't let the stick seat properly on this ASUS board.
When I looked closely and compared it to a slot that did work it had a tiny piece of plastic in that one slot left over from the molding process.
Xacto knife trimmed it and no more problem.
It was very small piece of plastic but in the tight slots that was all that was needed. This- * - was bigger than that extra piece was.
If like me clean your reading glasses and drag out the magnifying glass.

My Computer
At a glance
Windows7 Pro 64bit SP-1; Windows XP Pro 32bitIntel Core i7-870 Lynnfield 2.93GHz LGA 1156 ...8GB@1400MHz Crucial Ballistix DDR3-1600 4x2GBASUS ENGTX460 DirectCU/2DI/1GD5 1GB 256-bit G...
- Computer Manufacturer/Model Number
- Hopalong/ Godzilla
- OS
- Windows7 Pro 64bit SP-1; Windows XP Pro 32bit
- CPU
- Intel Core i7-870 Lynnfield 2.93GHz LGA 1156 95W Quad-Core
- Motherboard
- ASUS P7P55D-E PRO
- Memory
- 8GB@1400MHz Crucial Ballistix DDR3-1600 4x2GB
- Graphics Card(s)
- ASUS ENGTX460 DirectCU/2DI/1GD5 1GB 256-bit GDDR5
- Sound Card
- VIA Onboard
- Monitor(s) Displays
- Asus VS248H-P 24"; Samsung SyncMaster 941BW 19"ws
- Screen Resolution
- 1920x1080; 1440x900
- Hard Drives
- Samsung 830 120GB SSD
Intel 320 120GB SSD
Western Digital Caviar Black WD7501AALS 750GB 7200 RPM SATA 3.0Gb/s
Western Digital Caviar Black WD6401AALS 640GB 7200 RPM SATA 3.0Gb/s
- PSU
- COOLER MASTER Silent Pro RS850-AMBAJ3-US 850W Modular
- Case
- COOLER MASTER HAF 932 RC-932-KKN5-GP Black
- Cooling
- Scythe "Mugen-2 Rev.B" (2 ScytheKaze-Jyuni PWM fans)
- Keyboard
- Logitech K-320
- Mouse
- Kensington
- Antivirus
- Avast Inernet Suite
- Browser
- IE 9 ; Chrome

