Sony Vaio - VGN-FW21L - or model number PCG-3D1m. Originally supplied with Vista but upgraded to W7. Hard drive was corrupted and laptop would not boot to W7. Removed drive and recovered user data.
Booted from W7 cd and tried repair - still would not boot - eventually BSOD. DriverPowerState_Failure, or similar.
Chkdsk failed to repair disk. Tried to boot again - BSOD so shut down.
Now I get nothing - no POST, no beeps, even with RAM and hard drive removed. Nothing on external monitor. Have removed battery, held power key for 30 seconds, still nothing.