Hey, so I replaced a cracked lcd screen for an HP laptop g6 pavilion. However, after the screen was replaced it now just flashes solid colors, blue, green, red, black, and white. I looked it up and it seems o be some sort of factory reset. However hen I hdmi my laptop to a tv, it works fine, so something isn't connecting somehow...

the actuall screen LCD is bad.
in most cases.
supper common failure.. 2008 PC.
see page 31 , part 5 here. bingo, change that out.
there are 2 types used, only your full PC part number on
the service tag show this, post that and we go to the HP parts surfer and look it up.

http://h10032.www1.hp.com/ctg/Manual/c01918142

check the ram

This is a faulty gamma setting in the screen driver setup, enter control panel and screen settings you should find something called "color calibration" or enter the screen resolution and select advanced settings or if its possible use the graphic cards own settings panel to adjust the gamma setting.

When the screen turns on does it show anything or does it turn on and go to black?

If it goes to straight black it could be two things typically.
1. The LCD screen is having an issue. Connection cable / LCD screen itself.
2. The Graphics Card has gone out.

I'm sorry to say it very much sounds like the on going problem with the HP video.
If the video is on board, the system board will need to be repaired or replaced

if you want to replace the screen i suggest to replace the whole unit.since its hard to find lcd screen only unless in the manufacturer.then i'm sure the price is like you buy new one.

If the LCD screen is not physically broken ie a cracked screen then it could have a faulty inverter or a faulty CCFL lamp which will give you a black screen. The inverter and CCFL lamp is a lot cheaper to replace than a complete new LCD screen.
Check out LCD Parts WEB site for service, parts and DIY info. Click on this link to their WEB site :-
www.lcdparts.net

If the lines change or go away when you move the lid up and down, then you need a new LCD cable. If they stay the same, then you need a new LCD.

Please note: That test is NOT fool proof, but does work 99.9% of the time.

Have you tried connecting this monitor to another computer, even a laptop. This would tell you whether the display is bad or the video card is the culprit. I suspect the monitor's power supply is dying. Taking it to a pro for repair should cost @55.00. Buying a new monitor @ $100 - $125.

try ebay
if you get a screen go to http://repair4laptop.org/disassembly_acer.html to find out how to put it in