A300-27q bricked after repasting.

My rig is in the signature but a friend's Toshiba was running a little hot when playing Counter-Strike Source, so I asked him to let me clean it with an air blower and do a repaste job since it's never been done since purchase (2007-8).

The disassembly was straight forward surprisingly and the laptop was fairly clean from the inside. After the repaste (MX-4) the laptop would switch on in the sense that you saw the indicators on the panel, but the screen stayed dead as if out of power. I assumed it was a power plug to Mobo issue or maybe the GPU re-installation was sloppy or something, but all was in order and I repasted again. This time it became a complete brick, no LED indicators or any activity of any sort including the battery charging LED. I was grounded in both cases (barefoot in an earthed flat with ceramic tiles).

Any idea what's up? It's embarrassing since I've repasted and disassmebled around 30 laptops in the past 3 years, and I have no clue what the problem might be before taking it to the dealership to get shanked on prices, or get him a replacement laptop.

 

1. Did you add more RAM or do another upgrade? If no then try resetting RAM modules again. Also try to use pencil's erasing gum on pins od RAM and GPU. And blow some air in the connectors. Did you take off CPU or just RAM and GPU?
Second time you could forget some wire to connect so try again. Very slowly. Use youtube video to make sure. It is good for a beginning to make it show at least some signs of life. Then you may try to power drain and hold power buttons (even though it should be power drained already as it was disassembled).

Some laptops will not boot even if bottom cover is not back on. Mobo has pins which are connected to metal parts of case so check everything you can.

 

Didn't add RAM or upgrade anything. RAM and GPU connectors were whistle clean and the case in general was fairly clean too. I took off the RAM/CPU/GPU and tried reseating the RAMs a few times. Of course the symptom of unseated RAM would be BIOS error beep of some sort which wasn't there. There's this one inconspicuous screw out of 22 on the bottom case cover that wouldn't screw back in, but I highly doubt that particular screw is connected to some circuit. The service manual didn't say anything about it.

 

Doublecheck if CPU has all pins straight.

 

It does. My only suspicion is some strange static effect. the symptoms mean there's something wrong with the power supply to the mobo.

 

It is notebook. Symptoms can mean anything