After upgrading the hard drive it’s not detected by the laptop BIOS. The hard drive doesn’t appear in the BIOS.

Possible cause:

1. Hard drive is not connected properly.
2. Hard drive not supported.
3. Bad hard drive.

Possible troubleshooting steps and repair solution:

1. Make sure the hard drive is properly connected to the motherboard. Try reconnecting the hard drive. Find out if the hard drive appears in the BIOS after reconnecting.

2. Enter the BIOS setup menu and load default settings. Safe settings and restart the laptop. There is a chance that your new hard drive will be detected after that.

3. If you installed a larger hard drive, make sure it’s supported by the laptop. Some older laptops will not support large hard drives. In some cases, a larger hard drive will be supported after you upgrade laptop BIOS to the latest version.
Upgrade the BIOS if needed.

4. Try installing the old hard drive. If the old drive is detected but the new one is not, it’s possible that your new hard drive is defective.

The laptop starts with a blue screen error after memory upgrade.

Possible cause:

1. Memory not seated correctly.
2. Bad memory module.
3. Bad memory slot on motherboard.

Possible troubleshooting steps and repair solution:

I assume that you are using the right memory type and size for your laptop.

1. It’s possible the memory module was installed incorrectly. Try reconnecting the module. Remove it from the slot and install back. Test the laptop.

2. Check out all contacts on the memry module. Make sure all contacts are clean. Take a look into the memory slot. Make sure there is no junk inside the memory slot.

3. If you installed new memory module instead of the old one, try installing the old memory module back and test the laptop. If the laptop works fine with the old module but not the new one, it’s possible that your new memory module is defective. You can test memory with Memtest86+ utility (google it).

4. If you installed new memory module into the emptly slot, it’s possible that the slot itself is defective. Move the new memory module into another slot and test the laptop. If the laptop works fine when installed into the second slot, the first memory slot could be bad. In this case you’ll have to replace the motherboard or use the laptop with only one memory module installed into the good slot.