Stuck on startup screen AFTER pram reset
Computer was working fine but was running slow and I had also just replaced the battery and trackpad with non Apple parts so I decided to do a PRAM reset, now the computer won’t start at all.
Will not boot in safe mode, or let me start while holding “O” or command + R.
I tried another PRAM reset but still didn’t do anything.
Update (10/07/2017)
The computer was working after I installed the parts. I used it for an hour or so and everything seemed fine.
The slowness I was experiencing was not new after the new parts, it was an existing problem, which prompted the pram reset and the following failure
MacBook Pro "Core 2 Duo" 2.26 13" (SD/FW) 2.26 GHz Core 2 Duo (P7550*)
Intro. June 8, 2009 Disc. April 13, 2010
Order MB990LL/A Model A1278 (EMC 2326*)
Family Mid-2009 13" ID MacBookPro5,5
RAM 2 GB VRAM 256 MB
Storage 160 GB HDD Optical 8X DL "SuperDrive"
Complete MacBook Pro "Core 2 Duo" 2.26 13" (SD/FW) Specs
Is this a good question?
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2 
Can you isolate down which of the many 13" MacBooks you have. The easiest way is to plug your systems S/N here: EveryMac - Lookup then paste the URL link here for us to see.
by Dan
As to the parts you put in where did you get them and are you sure you got the correct parts for your system? I'm suspecting you got the wrong part here.
by Dan
https://everymac.com/systems/apple/macbo...
by mayer
What color is the MagSafe charger LED and what does the battery checker tell you when you don't have the MagSafe power adapter connected?
by Dan