Hello there!
I ve found similar threads but hard to know which one is the one.
I have an HP touch smart 600-1050gr (64bit version) with 4gb RAM (http://support.hp.com/us-en/document/c01862319)
I bought two of this http://www.goodram.com/product/ram-modules/goodram-ddr3-so-dimm/
I replaced the old ones with these and I soon as I try to reboot, the monitor stays black.
I ve found similar threads but hard to know which one is the one.
I have an HP touch smart 600-1050gr (64bit version) with 4gb RAM (http://support.hp.com/us-en/document/c01862319)
I bought two of this http://www.goodram.com/product/ram-modules/goodram-ddr3-so-dimm/
I replaced the old ones with these and I soon as I try to reboot, the monitor stays black.